MIL-PRF-46176B
4.3.3.2 Wet boiling point. Humidify the brake fluid IAW 4.3.6.3. Determine the wet
boiling point of the humidified brake fluid IAW SAE J1703 to verify conformance to 3.3.2. A
wet boiling point of less than 207°C shall constitute failure of this test.
4.3.3.3 Flash point. Determine the flash point of the brake fluid IAW ASTM D92 to
verify conformance to 3.3.3. A flash point of less than 204°C shall constitute failure of this test.
4.3.3.4 Viscosity.
4.3.3.4.1 Low temperature (-55°C). Determine the kinematic viscosity of the brake fluid
at -55°C IAW ASTM D445 to verify conformance to 3.3.4.1. A kinematic viscosity of more
than 900 mm²/s shall constitute failure of this test.
4.3.3.4.2 High temperature (100°C). Determine the kinematic viscosity of the brake fluid
at 100°C IAW ASTM D445 to verify conformance to 3.3.4.2. A kinematic viscosity of less than
1.3 mm²/s shall constitute failure of this test.
4.3.3.5 Stroking performance. Subject the brake fluid to the stroking test IAW procedure
A of method 361 of FED-STD-791, and perform the tests of 4.3.3.5.1 through 4.3.3.5.9 to verify
conformance to 3.3.5. Use SAE SBR cups in the master cylinder and wheel cylinders (see 6.4).
The brake fluid shall be subjected to the stroking schedule as specified in table III.
TABLE III. Stroking schedule.
Temperature,
Percent
Pressure,
Strokes per
Number of
°C
stroke ratio
kPa
hour
strokes
+25
60/40
3448
1000
16000
+25 to 30
40/60
3448
720
17000
-30 to 55
25/75
3448
180
1500
-55
25/75
3448
180
13000
-55 to +25
25/75
3448
180
3000
+25 to +120
50/50
6896
1000
8000
+120
50/50
6896
1000
44000
4.3.3.5.1 Cylinder and piston diameter change. Measure the diameters of the cylinders
and pistons IAW method 361 of FED-STD-791 before and after the stroking test to verify
conformance to 3.3.5.1. A diameter change of more than 0.13 mm for any cylinder or piston shall
constitute failure of this test.
4.3.3.5.2 Cup base diameter change. Measure the base diameters of the rubber cups IAW
method 361 of FED-STD-791 before and after the stroking test to verify conformance to 3.3.5.2.
An increase in diameter of more than 0.90 mm for any cup shall constitute failure of this test.
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