MIL-PRF-46176B
3.3.5 Stroking performance. The stroking performance of the brake fluid shall be
demonstrated by meeting the requirements specified in 3.3.5.1 through 3.3.5.9 (see 4.3.3.5).
3.3.5.1 Cylinder and piston diameter change. The change in the diameter of any cylinder
or piston shall not exceed 0.13 millimeter (mm) after completion of the stroking test as specified
in 4.3.3.5 (see 4.3.3.5.1).
3.3.5.2 Cup base diameter change. The change in the base diameter of any rubber cup
shall not exceed 0.90 mm after completion of the stroking test as specified in 4.3.3.5
(see 4.3.3.5.2).
3.3.5.3 Cup hardness change. The decrease in the hardness of any rubber cup shall not
exceed 15 points after completion of the stroking test as specified in 4.3.3.5 (see 4.3.3.5.3).
3.3.5.4 Cup lip interference set. The average lip interference set of the rubber cups shall
not exceed 65 percent (%) after completion of the stroking test as specified in 4.3.3.5
(see 4.3.3.5.4).
3.3.5.5 System pressure change. The pressure in the simulated brake system shall not
increase more than 241 kilopascals (kPa) or decrease more than 345 kPa from the initial pressure
during any 12-hour period of the stroking test as specified in 4.3.3.5 (see 4.3.3.5.5).
3.3.5.6 System fluid loss during test. The volume loss of brake fluid due to leakage and
evaporation shall not exceed 36 milliliters (mL) at the end of any 24-hour period of the stroking
test as specified in 4.3.3.5 (see 4.3.3.5.6).
3.3.5.7 System fluid loss - end of test. The volume loss of brake fluid shall not exceed 36
mL during the 100 strokes following completion of the stroking test as specified in 4.3.3.5 (see
4.3.3.5.7).
3.3.5.8 Fluid sediment. The brake fluid shall not contain more than 2% sediment by
volume after completion of the stroking test as specified in 4.3.3.5 (see 4.3.3.5.8).
3.3.5.9 Piston performance. During the stroking test as specified in 4.3.3.5, the master
cylinder piston and wheel cylinder pistons shall show no improper functioning which may be
attributed to the brake fluid properties, such as excessive increase in pressure (see 3.3.5.5),
seizing of the pistons, or failure of the pistons to permit brake release (see 4.3.3.5.9).
3.4 Interface requirements.
3.4.1 Corrosiveness. The corrosiveness of the brake fluid shall be demonstrated by
meeting the requirements specified in 3.4.1.1 through 3.4.1.7 (see 4.3.4.1).
3.4.1.1 Condition of cups. The rubber cups shall show no sloughing, tackiness, blisters,
or any other form of disintegration after exposure to the brake fluid as specified in 4.3.4.1
(see 4.3.4.1.1).
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