MIL-PRF-46176B
3.6.3.5 Appearance at 60°C. The brake fluid, humidified as specified in 4.3.6.3, shall
show no stratification, separation, precipitation, or crystallization after being subjected to a
temperature of 60 ± 2°C for 22 ± 2 hours (see 4.3.6.3.5).
3.6.3.6 Fluid sediment at 60°C. The brake fluid, humidified as specified in 4.3.6.3, shall
not contain more than 0.05% sediment by volume after being subjected to a temperature of
60 ± 2°C for 22 ± 2 hours (see 4.3.6.3.6).
3.6.3.7 Viscosity. The kinematic viscosity of the brake fluid, humidified as specified in
4.3.6.3, shall meet the requirements of 3.3.4 (see 4.3.6.3.7).
4. VERIFICATION
4.1 Classification of Inspection. The inspection requirements specified herein are
classified as follow:
a. Qualification Inspection (see 4.1.1).
b. Conformance Inspection (see 4.1.2).
4.1.1 Qualification Inspection. The qualification inspection shall consist of all the tests
specified herein.
4.1.2 Conformance Inspection. Conformance inspection shall consist of all tests specified
herein except for the stroking test (see 4.3.3.5) and the compatibility test (see 4.3.5.1).
4.2 Order of inspection. The environmental requirement verifications shall be performed
first. Unless otherwise specified, the remaining inspections shall be performed in any sequence.
4.3 Verification methods. Acceptable verification methods included in this section are
visual inspection, measurement, sample tests, full-scale demonstration tests, simulation, modeling,
engineering evaluation, component properties analysis, and similarity to previously-approved or
previously-qualified designs.
4.3.1 Verification alternatives. The manufacturer may propose alternative test methods,
techniques, or equipment, including the application of statistical process control, tool control, or
cost-effective sampling procedures to verify performance. See the contract for alternatives that
replace verification methods required by this specification.
4.3.2 Inspection conditions. Unless otherwise specified, all inspections shall be performed
at a temperature of 25 ± 3°C and a relative humidity of 50 ± 20%.
4.3.3 Operating requirements verifications.
4.3.3.1 Equilibrium reflux boiling point. Determine the equilibrium reflux boiling point of
the brake fluid in accordance with (IAW) SAE J1703 to verify conformance to 3.3.1. An
equilibrium reflux boiling point of less than 260°C shall constitute failure of this test.
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