in accordance with the test requirements of the Federal Motor Vehicle Safety Standard No. (02/ Edition) and SAE J (Feb ). Superseding J SEP Road Vehicle-Hydraulic Brake Hose Assemblies for Use with. Nonpetroleum-Base Hydraulic Fluids. Scope-This SAE Standard. SAE J - SURFACE VEHICLE STANDARD J REV. JUN Issued Revised.
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assemblies in accordance with the test requirements (see specification legend below). Test Legend: A (FMVSS ) B (SAE J) C (ADR 7/00). G (ISO ). AIR BRAKE SAE J Balflex. ®. AUTOMOTIVE AIR BRAKE – According to SAE J SAE J HYDRAULIC BRAKE 1/8” – Test Equipment and Instrumentation. Circular ADR 7 Hydraulic Brake Hoses. Other References. SAE J - (Jan ) - Road Vehicle - Hydraulic Brake.
It is also exposed to damage from debris and heat from the brakes. If any of these signs are present, replace the hose: Cracks: Try flexing the hose to expose cracks. No matter how small, shallow or random the crack, the hose should be replaced.
Blisters or Bubbles: Having someone pump the pedal will help spot this type of damage. The hose should not change shape.
If even the smallest deformation is detected, replace the hose. Leaks or Stains: Brake hoses should never leak. A leak is lost braking force and an entry point for air and moisture.
Air in the fluid is bad because air is compressible. Physical Damage: Run your fingers a long the length of the hose. A brake hose should be free of any irregularities.
Corrosion on the Fitting: Most fittings are plated to prevent corrosion. If this plating wears away, corrosion can occur at an accelerated rate. All piping and connections shall be smooth bore without recesses or offsets so all air may be freely removed from the system before running each test. Valves shall be capable of withstanding pressures involved without leakage. See Figure 2.
What DOT Really Means: Brake Hose Inspection And Replacement
These correction factors should be established at pressures of 6. All fittings and adapters used in testing of the assembly shall be in this system. This may require the attachment of the tubing to the brake hose fittings in the case of special end configurations. The calibration correction factors shall be subtracted from the expansion readings obtained on the test specimens.
The maximum permissible calibration correction factor shall be 0. Apply At the expiration of this hold period, increase the pressure at Read the maximum pressure obtained on the calibrated gage to the nearest 1 MPa psi and record as the bursting strength of the hose assembly.
Products | fittings for brake hose according to SAE J1401
Test Apparatus—The apparatus shall consist of a suitable pressure system where hose is connected so that controlled and measured fluid pressure may be applied internally.
The pressure shall be obtained by means of a hand- or power-driven pump or an accumulator system and it shall be measured with a calibrated gage. Provision shall be made for filling the hose with water or brake fluid and allowing all air to escape through a relief valve prior to application of pressure.
This is important as a safety measure. The hold and burst pressures shall be applied at a rate increase of Since this type of hose withstands a minimum bursting pressure of 49 MPa psi for 3.
The apparatus described for the expansion test may be used when it conforms to these requirements. Drain the brake hose assembly, and within 10 min, determine, per 4.
The brake hose assembly shall be burst within 3 h using the test specified in 4. Use a vernier caliper scale or equivalent and report the length between fittings to within a tolerance of 0. Equip the nonrotating header to permit attachment of each assembly with individual adjustment for length.
When mounted in the whip test machine see Figure 4 , the projected length of the hose assembly shall be less than the free length by the amount indicated as slack in Table 2 see Figure 5.
Take the projected length parallel to the axis of the rotating head.
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Install the test specimen assemblies in the apparatus without any twist. Apply the water pressure and bleed all hose and passages to eliminate air pockets or bubbles. Start the motor rotating the movable head. Periodically check the rpm. Failure of the specimen by water leakage and subsequent loss of pressure terminates the test. Note the elapsed time of the test prior to termination. Test Apparatus—The test apparatus shall provide the same motion to the specimens as the following: a movable header consisting of a horizontal bar mounted at each end on vertically rotating disks through bearings with centers placed Each header is provided with end connections in which the hose assemblies are mounted in a parallel manner.
The end connections on the movable header are tightly capped, while those on the stationary header are open to a manifold through which water pressure is supplied by a suitable means.
The hose assemblies are subjected during testing to a constant water pressure, which shall be maintained between 1. A limit switch shall be used to stop the machine when the water pressure drops, as in the case of hose failure, since it is essential that the machine stop if the pressure drops.
An elapsed time indicator shall be provided.
Record the total load at the time of failure, the type of failure, and the separation rate. The machine shall be provided with a recording device to give the total pull in Newtons pounds at the conclusion of the test.
A machine of 4. The specimen shall be held so that the hose fittings have a straight centerline corresponding to the direction of the machine pull. Then while still at this temperature, bend the hose at least degrees around the mandrel at a steady rate in a period of 3 to 5 s.
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Examine the cover of the brake hose with a naked eye for cracks or breaks. Test Apparatus—The mandrel diameter shall be The cylinder and binding shall be made of metal or materials that prevent the consumption of ozone. If the hose collapses when bent around the cylinder, provide for internal support of the hose. Examine the cover of the hose for cracks under 7X magnification, ignoring the areas immediately adjacent to or within the area covered by the binding.
Construct the salt spray chamber so that: 4. Ensure that the solution is free of suspended solids before the solution is atomized.
Pressure Cycling Apparatus—The pressure cycling apparatus shall be capable of applying a pressure of 11 MPa psi. Disconnect the assemblies from the impulse apparatus, and drain the fluid. Brake hoses should be inspected visually and with your hands. It might be helpful to have someone pump the brake pedal to spot a defective brake hose. Failure typically occurs at the ends of the hose. It is also exposed to damage from debris and heat from the brakes.
If any of these signs are present, replace the hose: Cracks: Try flexing the hose to expose cracks. No matter how small, shallow or random the crack, the hose should be replaced. Blisters or Bubbles: Having someone pump the pedal will help spot this type of damage. The hose should not change shape. If even the smallest deformation is detected, replace the hose. Leaks or Stains: Brake hoses should never leak. A leak is lost braking force and an entry point for air and moisture.
Air in the fluid is bad because air is compressible. Physical Damage: Run your fingers a long the length of the hose.Brass fittings have adequate corrosion resistance; therefore, salt spray testing of brass fittings is not required. Blisters or Bubbles: Having someone pump the pedal will help spot this type of damage.
If a caliper is sold, recommend a new brake hose.
Blisters or Bubbles: Having someone pump the pedal will help spot this type of damage. SAE invites your written comments and suggestions. Corrosion on Brackets and Mounting Hardware: Rust on the brackets can constrict a hose.
If any of these signs are present, replace the hose: Cracks: Try flexing the hose to expose cracks. Allow the gage to drop of its own weight for the full length of the probe. Failure typically occurs at the ends of the hose.