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FED-STD-791 Lubricants, Liquid Fuels, And Related Products, Testing Method OfThis test method standard is composed of standard test methods for sampling, inspecting and testing lubricants, liquid fuels and related products. It is issued pursuant to the Federal Property and Administration Services Act of 1949, as amended and its application to the purchase of commodities referred to herein is mandatory on all Federal agencies.

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'NOTE:This draft dated 15 April 2006' by DasH - Page 50 of 460
FED-STD-791D
Method 361.4
September 30, 1986
STROKING PROPERTIES OF HYDRAULIC BRAKE FLUIDS
1. SCOPE
1.1 This method describes a procedure for evaluating the stroking properties of brake
fluids used in the hydraulic brake systems of automotive vehicles. This method, with slight
modifications, may be used to evaluate hydraulic brake rubber cups against a standard brake
fluid.
2. SUMMARY
2.1 The method utilizes standard Society of Automotive Engineers (SAE) hydraulic
brake parts mounted in a manner similar to that of an automobile brake system. The test brake
fluid is subjected to various stroking rates, pressures, and temperatures designed to evaluate the
lubrication properties of the brake fluid. This method complements the chemical and physical
tests required by the brake fluid specifications.
2.2 It is essential to have meaningful reference data before a significant interpretation of
test results can be made. Reference data must include comparable test information on a brake
fluid of known service performance characteristics.
3. SAMPLE SIZE
3.1 Approximately 3.8 L (1 gal) of the brake fluid to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 SAE Standard.
J 1703 - Motor Vehicle Brake Fluid
4.2 ASTM Standard.
D 2240 - Rubber Property-Durometer Hardness
4.3 Apparatus.
4.3.1 Wheel assemblies.1 Four left front wheel brake assemblies.
1
An alternative to the wheel assemblies is described in section 4.12 of SAE J 1703.
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