MIL-PRF-46176B
3.4.1.2 Cup base diameter change. The change in the base diameter of any rubber cup
shall be not less than 0.03 mm and not more than 1.40 mm after exposure to the brake fluid as
specified in 4.3.4.1 (see 4.3.4.1.2).
3.4.1.3 Cup hardness change. The decrease in the hardness of any rubber cup shall not
exceed 15 points after exposure to the brake fluid as specified in 4.3.4.1 (see 4.3.4.1.3).
3.4.1.4 Condition of metal strips. The metal strips shall not be pitted nor etched after
exposure to the brake fluid as specified in 4.3.4.1 (see 4.3.4.1.4).
3.4.1.5 Metal strip weight change. The permissible change in weight of the strips shall be
as specified in table I after exposure to the brake fluid as specified in 4.3.4.1 (see 4.3.4.1.5).
3.4.1.6 Condition of brake fluid. The brake fluid shall exhibit no gelling at 25 ± 5°C, and
no crystallization deposit shall form, after completion of the corrosiveness test as specified in
4.3.4.1 (see 4.3.4.1.6).
3.4.1.7 Fluid sediment. The brake fluid shall not contain more than 0.10% sediment by
volume after completion of the corrosiveness test as specified in 4.3.4.1 (see 4.3.4.1.7).
TABLE I. Permissible metal strip weight changes.
Maximum weight change,
Strip material
milligrams per square centimeter
(mg/cm²)
Tinned steel
0.1
Carbon steel
0.1
Aluminum alloy
0.1
Cast iron
0.1
Brass
0.2
Copper
0.2
3.4.2 Effects on rubber. The effects of the brake fluid on rubber shall be demonstrated by
meeting the requirements specified in 3.4.2.1 through 3.4.2.4 (see 4.3.4.2).
3.4.2.1 Volume swell. The volume swell of the test specimens shall meet the
requirements of table II after exposure to the brake fluid as specified in 4.3.4.2 (see 4.3.4.2.1).
3.4.2.2 Base diameter change. The base diameter change of the test specimens shall meet
the requirements of table II after exposure to the brake fluid as specified in 4.3.4.2 (see 4.3.4.2.2).
3.4.2.3 Hardness change. The hardness change of the test specimens shall meet the
requirements of table II after exposure to the brake fluid as specified in 4.3.4.2 (see 4.3.4.2.3).
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