571.106—Standard No. 106; Brake hoses.
S1. Scope. This standard specifies labeling and performance requirements for motor vehicle brake hose, brake hose assemblies, and brake hose end fittings.
S2. Purpose. The purpose of this standard is to reduce deaths and injuries occurring as a result of brake system failure from pressure or vacuum loss due to hose or hose assembly rupture.
S3. Application. This standard applies to passenger cars, multipurpose passenger vehicles, trucks, buses, trailers, and motorcycles, and to hydraulic, air, and vacuum brake hose, brake hose assemblies, and brake hose end fittings for use in those vehicles.
S4. Definitions.
Armor means protective material installed on a brake hose to increase the resistance of the hose or hose assembly to abrasion or impact damage.
Brake hose means a flexible conduit, other than a vacuum tubing connector, manufactured for use in a brake system to transmit or contain the fluid pressure or vacuum used to apply force to a vehicle's brakes. For hose, a dimensional description such as “ 1/4 -inch hose” refers to the nominal inside diameter. For tubing, a dimensional description such as “ 1/4 -in tubing” refers to the nominal outside diameter.
Brake hose assembly means a brake hose, with or without armor, equipped with end fittings for use in a brake system, but does not include an air or vacuum assembly prepared by the owner or operator of a used vehicle, by his employee, or by a repair facility, for installation in that used vehicle.
Brake hose end fitting means a coupler, other than a clamp, designed for attachment to the end of a brake hose.
Free length means the linear measurement of hose exposed between the end fittings of a hose assembly in a straight position.
Permanently attached end fitting means an end fitting that is attached by deformation of the fitting about the hose by crimping or swaging, or an end fitting that is attached by use of a sacrificial sleeve or ferrule that requires replacement each time a hose assembly is rebuilt.
Preformed means a brake hose that is manufactured with permanent bends and is shaped to fit a specific vehicle without further bending.
Rupture means any failure that results in separation of a brake hose from its end fitting or in leakage.
Vacuum tubing connector means a flexible conduit of vacuum that (i) connects metal tubing to metal tubing in a brake system, (ii) is attached without end fittings, and (iii) when installed, has an unsupported length less than the total length of those portions that cover the metal tubing.
S5. Requirements—hydraulic brake hose, brake hose assemblies, and brake hose end fittings.
S5.1 Construction. (a) Each hydraulic brake hose assembly shall have permanently attached brake hose end fittings which are attached by deformation of the fitting about the hose by crimping or swaging.
(b)
Each hydraulic brake hose assembly that is equipped with a permanent supplemental support integrally attached to the assembly and is manufactured as a replacement for use on a vehicle not equipped, as an integral part of the vehicle's original design, with a means of attaching the support to the vehicle shall be equipped with a bracket that is integrally attached to the supplemental support and that adapts the vehicle to properly accept this type of brake hose assembly.
S5.2Labeling.
S5.2.1 Each hydraulic brake hose, except hose sold as part of a motor vehicle, shall have at least two clearly identifiable stripes of at least one-sixteenth of an inch in width, placed on opposite sides of the brake hose parallel to its longitudinal axis. One stripe may be interrupted by the information required by S5.2.2, and the other stripe may be interrupted by additional information at the manufacturer's option. However, hydraulic brake hose manufactured for use only in an assembly whose end fittings prevent its installation in a twisted orientation in either side of the vehicle, need not meet the requirements of S5.2.1.
S5.2.2 Each hydraulic brake hose shall be labeled, or cut from bulk hose that is labeled, at intervals of not more than 6 inches, measured from the end of one legend to the beginning of the next, in block capital letters and numerals at least one-eighth of an inch high, with the information listed in paragraphs (a) through (e) of this section. The information need not be present on hose that is sold as part of a brake hose assembly or a motor vehicle.
(a)
The symbol DOT, constituting a certification by the hose manufacturer that the hose conforms to all applicable motor vehicle safety standards.
(b)
A designation that identifies the manufacturer of the hose, which shall be filed in writing with: Office of Vehicle Safety Compliance, Equipment Division NVS-222, National Highway Traffic Safety Administration, 400 Seventh St. SW., Washington, DC 20590. The marking may consist of a designation other than block capital letters required by S5.2.2.
(c)
The month, day, and year, or the month and year, of manufacture, expressed in numerals. For example, 10/1/96 means October 1, 1996.
(d)
The nominal inside diameter of the hose expressed in inches or fractions of inches, or in millimeters followed by the abbreviation “mm.”
(e)
Either “HR” to indicate that the hose is regular expansion hydraulic hose or “HL” to indicate that the hose is low expansion hydraulic hose.
S5.2.3 Package labeling for brake hose assemblies designed to be used with a supplemental support. (a) Each hydraulic brake hose assembly that is equipped with a permanent supplemental support integrally attached to the assembly and is manufactured as a replacement assembly for a vehicle equipped, as an integral part of the vehicle's original design, with a means of attaching the support to the vehicle shall be sold in a package that is marked or labeled as follows: “FOR USE ON [insert Manufacturer, Model Name] ONLY”;
(b)
Each hydraulic brake hose assembly that is equipped with a permanent supplemental support integrally attached to the assembly and is manufactured as a replacement for use on a vehicle not equipped, as an integral part of the vehicle's original design, with a means of attaching the support to the vehicle shall comply with paragraphs (a) (1) and (2) of this section:
(1)
Be sold in a package that is marked or labeled as follows: “FOR USE ONLY WITH A SUPPLEMENTAL SUPPORT.”
(2)
Be accompanied by clear, detailed instructions explaining the proper installation of the brake hose and the supplemental support bracket to the vehicle and the consequences of not attaching the supplemental support bracket to the vehicle. The instructions shall be printed on or included in the package specified in paragraph (a)(1) of this section.
S5.2.4 Each hydraulic brake hose assembly, except those sold as part of a motor vehicle, shall be labeled by means of a band around the brake hose assembly as specified in this paragraph or, at the option of the manufacturer, by means of labeling as specified in S5.2.4.1. The band may at the manufacturer's option be attached so as to move freely along the length of the assembly, as long as it is retained by the end fittings. The band shall be etched, embossed, or stamped in block capital letters, numerals or symbols at least one-eighth of an inch high, with the following information:
(a)
The symbol DOT constituting certification by the hose assembler that the hose assembly conforms to all applicable motor vehicle safety standards.
(b)
A designation that identifies the manufacturer of the hose assembly, which shall be filed in writing with: Office of Vehicle Safety Compliance, Equipment Division NVS-222, National Highway Traffic Safety Administration, 400 Seventh St. SW., Washington, DC 20590. The designation may consist of block capital letters, numerals or a symbol.
S5.2.4.1At least one end fitting of a hydraulic brake hose assembly shall be etched, stamped or embossed with a designation at least one-sixteenth of an inch high that identifies the manufacturer of the hose assembly and is filed in accordance with S5.2.4(b).
S5.3Test requirements. A hydraulic brake hose assembly or appropriate part thereof shall be capable of meeting any of the requirements set forth under this heading, when tested under the conditions of S13 and the applicable procedures of S6. However, a particular hose assembly or appropriate part thereof need not meet further requirements after having been subjected to and having met the constriction requirement (S5.3.1) and any one of the requirements specified in S5.3.2 through S5.3.13.
S5.3.1Constriction. Except for that part of an end fitting which does not contain hose, every inside diameter of any section of a hydraulic brake hose assembly shall be not less than 64 percent of the nominal inside diameter of the brake hose (S6.12).
S5.3.2Expansion and burst strength. The maximum expansion of a hydraulic brake hose assembly at 1,000 psi, 1,500 psi and 2,900 psi shall not exceed the values specified in Table I (S6.1), except that a brake hose larger than 3/16 inch or 5 mm is not subject to the 2,900 psi expansion test requirements. The hydraulic brake hose assembly shall then withstand water pressure of 4,000 psi for 2 minutes without rupture, and then shall not rupture at less than 7,000 psi for a 1/8 inch, 3 mm, or smaller diameter hose, or at less than 5,000 psi for a hose with a diameter larger than 1/8 inch or 3 mm (S6.2).
| Hydraulic brake hose, inside diameter | Test pressure | 1,000 psi | Regularexpansionhose | Lowexpansionhose | 1,500 psi | Lowexpansionhose | Regularexpansionhose | 2,900 psi | Regularexpansionhose | Lowexpansionhose |
|---|---|---|---|---|---|---|---|---|---|---|
| 1/8 inch, or 3mm, or less | 0.66 | 0.33 | 0.79 | 0.42 | 1.21 | 0.61 | ||||
| > 1/8 inch or 3mm, to 3/16 inch or 5 mm | 0.86 | 0.55 | 1.02 | 0.72 | 1.67 | 0.91 | ||||
| > 3/16 inch or 5 mm | 1.04 | 0.82 | 1.30 | 1.17 | * | * |
S5.3.3Whip resistance. A hydraulic brake hose assembly shall not rupture when run continuously on a flexing machine for 35 hours (S6.3).
S5.3.4Tensile strength. A hydraulic brake hose assembly shall withstand a pull of 325 pounds without separation of the hose from its end fittings during a slow pull test, and shall withstand a pull of 370 pounds without separation of the hose from its end fittings during a fast pull test (S6.4).
S5.3.5Water absorption and burst strength. A hydraulic brake hose assembly, after immersion in water for 70 hours (S6.5), shall withstand water pressure of 4,000 psi for 2 minutes, and then shall not rupture at less than 5,000 psi (S6.2).
S5.3.6Water absorption and tensile strength. A hydraulic brake hose assembly, after immersion in water for 70 hours (S6.5), shall withstand a pull of 325 pounds without separation of the hose from its end fittings during a slow pull test, and shall withstand a pull of 370 pounds without separation of the hose from its end fittings during a fast pull test (S6.4).
S5.3.7Water absorption and whip resistance. A hydraulic brake hose assembly, after immersion in water for 70 hours (S6.5), shall not rupture when run continuously on a flexing machine for 35 hours (S6.3).
S5.3.8Low-temperature resistance. A hydraulic brake hose conditioned at a temperature between minus 49 degrees Fahrenheit (minus 45 degrees Celsius) and minus 54 degrees Fahrenheit (minus 48 degrees Celsius) for 70 hours shall not show cracks visible without magnification when bent around a cylinder as specified in S6.6 (S6.6).
S5.3.9Brake fluid compatibility, constriction, and burst strength. Except for brake hose assemblies designed for use with mineral or petroleum-based brake fluids, a hydraulic brake hose assembly shall meet the constriction requirement of S5.3.1 after having been subjected to a temperature of 248 degrees Fahrenheit (120 degrees Celsius) for 70 hours while filled with SAE RM-66-04 “Compatibility Fluid,” as described in appendix B of SAE Standard J1703, revised JAN 1995, “Motor Vehicle Brake Fluid.” This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from the Society of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096-0001. Copies may be inspected at the National Highway Traffic Safety Administration, Technical Information Services, 400 Seventh Street, SW., Plaza Level, Room 403, Washington, DC 20590, or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. It shall then withstand water pressure of 4,000 psi for 2 minutes and thereafter shall not rupture at less than 5,000 psi (S6.2 except all sizes of hose are tested at 5,000 psi).
S5.3.10Ozone resistance. A hydraulic brake hose shall not show cracks visible under 7-power magnification after exposure to ozone for 70 hours at 104 °F. (S6.8).
S5.3.12High temperature impulse test. A brake hose assembly tested under the conditions in S6.10:
(a)
Shall withstand pressure cycling for 150 cycles, at 295 degrees Fahrenheit (146 degrees Celsius) without leakage;
S5.3.13End fitting corrosion resistance. After 24 hours of exposure to salt spray, a hydraulic brake hose end fitting shall show no base metal corrosion on the end fitting surface except where crimping or the application of labeling information has caused displacement of the protective coating (S6.11).
S6. Test procedures—Hydraulic brake hose, brake hose assemblies, and brake hose end fittings.
S6.1.Expansion test.
S6.1.1Apparatus. Utilize a test apparatus (as shown in Figure 1) which consists of:
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S6.1.2Preparation. (a) Measure the free length of the hose assembly.
(b)
Mount the hose so that it is in a vertical straight position without tension when pressure is applied.
S6.1.3Calculation of expansion at 1,000 and 1,500 psi. (a) Adjust the fluid level in the burette to zero.
(b)
Close the valve to the burette, apply pressure at the rate of 15,000 psi per minute, and seal 1,000 psi in the hose (1,500 psi in the second series, and 2,900 psi in the third series).
(c)
After 3 seconds open the valve to the burette for 10 seconds and allow the fluid in the expanded hose to rise into the burette.
(d)
Repeat the procedure in steps (b) and (c) twice. Measure the amount of test fluid which has accumulated in the burette as a result of the three applications of pressure.
(e)
Calculate the volumetric expansion per foot by dividing the total accumulated test fluid by 3 and further dividing by the free length of the hose in feet.
S6.2Burst strength test. (a) Connect the brake hose to a pressure system and fill it completely with water, allowing all gases to escape.
(c)
After 2 minutes at 4,000 psi, increase the pressure at the rate of 15,000 psi per minute until the pressure exceeds 5,000 psi for a brake hose larger than 1/8 inch or 3 mm diameter, or until the pressure exceeds 7,000 psi for a brake hose of 1/8 inch, 3 mm, or smaller diameter.
S6.3Whip resistance test.
S6.3.1Apparatus. Utilize test apparatus that is dynamically balanced and includes:
(a)
A movable header consisting of a horizontal bar equipped with capped end fittings and mounted through bearings at each end to points 4 inches from the center of two vertically rotating disks whose edges are in the same vertical plane;
(b)
An adjustable stationary header parallel to the movable header in the same horizontal plane as the centers of the disks, and fitted with open end fittings;
S6.3.2 Preparation. (a) Except for the supplemental support specified in S6.3.2(d), remove all external appendages including, but not limited to, hose armor, chafing collars, mounting brackets, date band and spring guards.
(c)
Mount the hose in the whip test machine, introducing slack as specified in Table II for the size hose tested, measuring the projected length parallel to the axis of the rotating disks. The manufacturer may, at his option, adapt the fitting attachment points to permit mounting hose assemblies equipped with angled or other special fittings in the same orientation as hose assemblies equipped with straight fittings.
(d)
In the case of a brake hose assembly equipped with a permanent supplemental support integrally attached to the assembly, the assembly may be mounted using the supplemental support and associated means of simulating its attachment to the vehicle. Mount the supplemental support in the same vertical and horizontal planes as the stationary header end of the whip test fixture described in S6.3.1(b). Mount or attach the supplemental support so that it is positioned in accordance with the recommendation of the assembly manufacturer for attaching the supplemental support on a vehicle.
| Free length between end fittings, inches | Slack, inches | |
|---|---|---|
| 1/8 inch or 3 mm hose or less | More than 1/8 inch or 3 mm hose | |
| 8 to 151/2, inclusive | 1.750 | |
| 10 to 151/2, inclusive | 1,000 | |
| Over 151/2 to 19 inclusive | 1.250 | |
| Over 19 to 24, inclusive | 0.750 | |
S6.3.3Operation. (a) Apply 235 psi water pressure and bleed all gases from the system.
S6.4Tensile strength test. Utilize a tension testing machine conforming to the requirements of American Society for Testing and Materials (ASTM) E4-03, “Standard Practices for Force Verification of Testing Machines,” and provided with a recording device to measure the force applied. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from the American Society for Testing and Materials (ASTM) International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959. Copies may be inspected at the National Highway Traffic Safety Administration, Technical Information Services, 400 Seventh St., S.W., Plaza Level, Room 403, Washington, D.C. 20590, or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
S6.4.1Preparation. Mount the hose assembly to ensure straight, evenly distributed machine pull.
S6.4.2Operation. (a) Conduct the slow pull test by applying tension at a rate of 1 inch per minute travel of the moving head until separation occurs.
(b)
Conduct the fast pull test by applying tension at a rate of 2 inches per minute travel of the moving head until separation occurs.
S6.5Water absorption sequence tests. (a) Prepare three brake hose assemblies and measure the free length of the hose assemblies.
(b)
Immerse the brake hose assemblies in distilled water at 185 degrees Fahrenheit (85 degrees Celsius) for 70 hours. Remove the brake hose assemblies from the water and condition in air at room temperature for 30 minutes.
S6.6Low temperature resistance test.
S6.6.1Preparation. (a) Remove hose armor, if any, and condition the hose in a straight position in air at a temperature between minus 49 degrees Fahrenheit and minus 54 degrees Fahrenheit (minus 45 degrees Celsius and minus 48 degrees Celsius) for 70 hours.
(b)
Condition a cylinder in air at a temperature between minus 49 degrees Fahrenheit and minus 54 degrees Fahrenheit (minus 45 degrees Celsius and minus 48 degrees Celsius) for 70 hours, using a cylinder of 2 1/2 inches in diameter for tests of hose less than 1/8 inch or 3mm, 3 inches in diameter for tests of 1/8 inch or 3 mm hose, 3 1/2 inches in diameter for tests of 3/16 to 1/4 inch hose or 4 mm to 6 mm hose, and 4 inches in diameter for tests of hose greater than 1/4 inch or 6 mm in diameter.
S6.6.2Flexibility testing. Bend the conditioned hose 180 degrees around the conditioned cylinder at a steady rate in a period of 3 to 5 seconds. Examine without magnification for cracks.
S6.7Brake fluid compatibility test.
S6.7.1Preparation. (a) Attach a hose assembly below a 1-pint reservoir filled with 100 ml. of SAE RM-66-04 Compatibility Fluid as shown in Figure 2. (SAE RM-66-03 Compatibility Fluid, as described in appendix A of SAE Standard J1703 NOV83, “Motor Vehicle Brake Fluid,” November 1983, may be used in place of SAE RM-66-04 until January 1, 1995.)
(b)
Fill the hose assembly with brake fluid, seal the lower end, and place the test assembly in an oven in a vertical position.
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S6.7.2Oven treatment. (a) Condition the hose assembly at 200 °F. for 70 hours.
(c)
Drain the brake hose assembly, immediately determine that every inside diameter of any section of the hose assembly, except for that part of an end fitting which does not contain hose, is not less than 64 percent of the nominal inside diameter of the hose, and conduct the test specified in S6.2.
S6.8Ozone resistance test. Utilize a cylinder with a diameter eight times the nominal outside diameter of the brake hose excluding armor.
S6.8.1Preparation. After removing any armor, bind a hydraulic brake hose 360° around the cylinder. In the case of hose shorter than the circumference of the cylinder, bend the hose so that as much of its length as possible is in contact.
S6.8.2Exposure to ozone. (a) Condition the hose on the cylinder in air at room temperature for 24 hours.
(b)
Immediately thereafter, condition the hose on the cylinder for 70 hours in an exposure chamber having an ambient air temperature of 104 degrees Fahrenheit (40 degrees Celsius) during the test and containing air mixed with ozone in the proportion of 100 parts of ozone per 100 million parts of air by volume.
(c)
Examine the hose for cracks under 7-power magnification, ignoring areas immediately adjacent to or within the area covered by binding.
S6.9End fitting corrosion resistance test. Utilize the apparatus described in ASTM B117-64, “Salt Spray (Fog) Testing”.
S6.9Dynamic ozone test.
S6.9.1Apparatus. Utilize a test apparatus shown in Figure 3 which is constructed so that:
(a)
It has a fixed pin with a vertical orientation over which one end of the brake hose is installed.
(b)
It has a movable pin that is oriented 30 degrees from vertical, with the top of the movable pin angled towards the fixed pin. The moveable pin maintains its orientation to the fixed pin throughout its travel in the horizontal plane. The other end of the brake hose is installed on the movable pin.
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S6.9.2Preparation. (a) Precondition the hose assembly by laying it on a flat surface in an unstressed condition, at room temperature, for 24 hours.
(b)
Cut the brake hose assembly to a length of 8.6 inches (218 mm), such that no end fittings remain on the cut hose.
(c)
Mount the brake hose onto the test fixture by fully inserting the fixture pins into each end of the hose. Secure the hose to the fixture pins using a band clamp at each end of the hose.
(e)
Stabilize the atmosphere in the ozone chamber so that the ambient temperature is 104 °F (40 degrees Celsius) and the air mixture contains air mixed with ozone in the proportion of 100 parts of ozone per 100 million parts of air by volume. This atmosphere is to remain stable throughout the remainder of the test.
(g)
At the completion of 48 hours of cycling, remove the test fixture from the ozone chamber. Without removing the hose from the test fixture, visually examine the hose for cracks without magnification, ignoring areas immediately adjacent to or within the area covered by the band clamps. Examine the hose with the movable pin at any point along its travel.
S6.10High temperature impulse test.
S6.10.1Apparatus. (a) A pressure cycling machine to which one end of the brake hose assembly can be attached, with the entire hose assembly installed vertically inside of a circulating air oven. The machine shall be capable of increasing the pressure in the hose from zero psi to 1600 psi, and decreasing the pressure in the hose from 1600 psi to zero psi, within 2 seconds.
(b)
A circulating air oven that can reach a temperature of 295 degrees Fahrenheit (146 degrees Celsius) within 30 minutes, and that can maintain a constant 295 degrees F (146 degrees Celsius) thereafter, with the brake hose assembly inside of the oven and attached to the pressure cycling machine.
S6.10.2Preparation. (a) Connect one end of the hose assembly to the pressure cycling machine and plug the other end of the hose. Fill the pressure cycling machine and hose assembly with SAE RM-66-04 “Compatibility Fluid,” as described in appendix B of SAE Standard J1703, revised JAN 1995 “Motor Vehicle Brake Fluid,” and bleed all gases from the system.
(b)
Place the brake hose assembly inside of the circulating air oven in a vertical position. Increase the oven temperature to 295 degrees F (146 degrees Celsius) and maintain this temperature throughout the pressure cycling test.
(c)
During each pressure cycle, the pressure in the hose is increased from zero psi to 1600 psi and held constant for 1 minute, then the pressure is decreased from 1600 psi to zero psi and held constant for 1 minute. Perform 150 pressure cycles on the brake hose assembly.
(d)
Remove the brake hose assembly from the oven, disconnect it from the pressure cycling machine, and drain the fluid from the hose. Cool the brake hose assembly at room temperature for 45 minutes.
(e)
Wipe the brake hose using acetone to remove residual Compatibility Fluid. Conduct the burst strength test in S6.2, except all sizes of hose are tested at 5,000 psi.
S6.11End fitting corrosion test. Utilize the apparatus described in ASTM B117-03, “Standard Practice for Operating Salt Spray (Fog) Apparatus”. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from the American Society for Testing and Materials (ASTM) International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959. Copies may be inspected at the National Highway Traffic Safety Administration, Technical Information Services, 400 Seventh St., SW., Plaza Level, Room 403, Washington, DC 20590, or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
S6.11.1Construction. Construct the salt spray chamber so that:
(b)
The hose assembly is supported or suspended 30 degrees from the vertical and parallel to the principal direction of the horizontal flow of fog through the chamber.
(c)
The hose assembly does not contact any metallic material or any material capable of acting as a wick
(d)
Condensation which falls from the assembly does not return to the solution reservoir for respraying.
(e)
Condensation from any source does not fall on the brake hose assemblies or the solution collectors.
S6.11.2Preparation. (a) Plug each end of the hose assembly.
(b)
Mix a salt solution five parts by weight of sodium chloride to 95 parts of distilled water, using sodium chloride substantially free of nickel and copper, and containing on a dry basis not more than 0.1 percent of sodium iodide and not more than 0.3 percent total impurities. Ensure that the solution is free of suspended solids before the solution is atomized.
(c)
After atomization at 95 degrees Fahrenheit (35 degrees Celsius), ensure that the collected solution is in the PH range of 6.5 to 7.2. Make the PH measurements at 77 degrees Fahrenheit (28 degrees Celsius).
(d)
Maintain a compressed air supply to the nozzle or nozzles free of oil and dirt and between 10 and 25 psi.
S6.11.3Operation. Subject the brake hose assembly to the salt spray continuously for 24 hours.
(a)
Regulate the mixture so that each collector will collect from 1 to 2 milliliters of solution per hour for each 80 square centimeters of horizontal collecting area.
(c)
Upon completion, remove the salt deposit from the surface of the hose by washing gently or dipping in clean running water not warmer than 100 degrees Fahrenheit (38 degrees Celsius) and then drying immediately.
S6.12Constriction test. Brake hose constriction test requirements shall be met using at least one of the methods specified in S6.12.1, S6.12.2, or S6.12.3.
S6.12.1Plug gauge. (a) Utilize a plug gauge as shown in Figure 4. Diameter “A” is equal to 64 percent of the nominal inside diameter of the hydraulic brake hose being tested.
(b)
Brake hose assemblies that are to be used for additional testing have constriction testing only at each end fitting. Other brake hose assemblies may be cut into 3-inch lengths to permit constriction testing of the entire assembly. Hose assemblies with end fittings that do not permit entry of the gauge (e.g., restrictive orifice or banjo fitting) are cut 3 inches from the point at which the hose terminates in the end fitting and then tested from the cut end.
(d)
Place the spherical end of the plug gauge just inside the hose or end fitting. If the spherical end will not enter the hose or end fitting using no more force than gravity acting on the plug gauge, this constitutes failure of the constriction test.
(e)
Release the plug gauge. Within 3 seconds, the plug gauge shall fall under the force of gravity alone up to the handle of the gauge. If the plug gauge does not fully enter the hose up to the handle of the gauge within three seconds, this constitutes failure of the constriction test.
S6.12.2Extended plug gauge. (a) The test in 6.12.1 may be conducted with an extended plug gauge to enable testing of the entire brake hose from one end fitting, without cutting the brake hose. The extended plug gauge weight and spherical diameter specifications are as shown in Figure 4, but the handle portion of the gauge may be deleted and the gauge length may be greater than 3 inches.
(b)
The required performance of the extended plug gauge in S6.12.1(e) is that after the plug gauge is released, the extended plug gauge shall fall under the force of gravity alone at an average rate of 1 inch per second until the spherical diameter of the extended gauge passes through all portions of the brake hose assembly containing hose. If the extended plug gauge does not pass through all portions of the brake hose assembly containing hose at an average rate of 1 inch per second, this constitutes failure of the constriction test.
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S6.12.3Drop ball test. (a) Utilize a rigid spherical ball with a diameter equal to 64 percent of the nominal inside diameter of the hydraulic brake hose being tested. The weight of the spherical ball shall not exceed 2 ounces (57 grams).
(d)
Release the ball. The ball shall fall under the force of gravity alone completely through all portions of the brake hose assembly containing hose, at an average rate of 1 inch per second. Failure of the ball to pass completely through all portions of the brake hose assembly containing hose, at an average rate of 1 inch per second, constitutes failure of the constriction test.
S7. Requirements—Air brake hose, brake hose assemblies, and brake hose end fittings.
S7.1Construction. Each air brake hose assembly shall be equipped with permanently attached brake hose end fittings or reusable brake hose end fittings. Each air brake hose constructed of synthetic or natural elastomeric rubber shall conform to the dimensional requirements specified in Table III, except for brake hose manufactured in metric sizes.
S7.2Labeling
S7.2.1 Hose. Each air brake hose shall be labeled, or cut from bulk hose that is labeled, at intervals of not more than 6 inches, measured from the end of one legend to the beginning of the next, in block capital letters and numerals at least one-eighth of an inch high, with the information listed in paragraphs (a) through (e) of this section. The information need not be present on hose that is sold as part of a brake hose assembly or a motor vehicle.
(a)
The symbol DOT, constituting a certification by the hose manufacturer that the hose conforms to all applicable motor vehicle safety standards.
(b)
A designation that identifies the manufacturer of the hose, which shall be filed in writing with: Office of Vehicle Safety Compliance, Equipment Division NVS-222, National Highway Traffic Safety Administration, 400 Seventh St. SW., Washington, DC 20590. The designation may consist of block capital letters, numerals, or a symbol.
(c)
The month, day, and year, or the month and year, of manufacture, expressed in numerals. For example, 10/1/96 means October 1, 1996.
(d)
The nominal inside diameter of the hose expressed in inches or fractions of inches or in millimeters. The abbreviation “mm” shall follow hose sizes that are expressed in millimeters. (Examples: 3/8, 1/2 ( 1/2 SP in the case of 1/2 inch special air brake hose), 4mm, 6mm.)
(e)
The type designation corresponding to the brake hose dimensions in Table III. Type A shall be labeled with the letter “A”, Type AI shall be labeled with the letters “AI”, and type AII shall be labeled with the letters “AII”. Metric air brake hose shall be labeled with the letter “A.”
| Type A—Hose Size—Nominal Inside Diameter | ||||||
|---|---|---|---|---|---|---|
| 1/4 | 5/16 | 3/8 | 7/16 | 1/2 SP (1) | 5/8 | |
| Min. I.D. | 0.227(5.8) | 0.289(7.3) | 0.352(8.9) | 0.407(10.3) | 0.469(11.9) | 0.594(15.1) |
| Max. I.D. | 0.273(6.9) | 0.335(8.5) | 0.398(10.1) | 0.469(11.9) | 0.531(13.5) | 0.656(16.7) |
| Min. O.D. | 0.594(15.1) | 0.656(16.7) | 0.719(18.3) | 0.781(19.8) | 0.844(21.4) | 1.031(26.2) |
| Max. O.D. | 0.656(16.7) | 0.719(18.3) | 0.781(19.8) | 0.843(21.4) | 0.906(23.0) | 1.094(27.8)
|