MIL-DTL-14055G
b. Four wheel cylinder cups shall be subjected to the tests.
1. The specimens shall be stabilized at room temperature.
2. The specimens shall be rinsed in isopropyl alcohol or ethyl alcohol and wiped dry with a lint-
free cloth.
3. The specimens shall not remain in the alcohol for more than 30 seconds.
4. Two of the specimens shall have the durometer hardness determined as specified in 4.7.2 and
recorded.
5. The lip and base diameters of the two specimens shall be measured to the nearest 0.001 inch
(0.025mm), and the results recorded. The measurements shall be made by taking the
average of two readings at right angles to each other. Base diameter measurement shall be
taken within 0.015 inch (0.38 mm) from the back and parallel to the base of the specimen.
6. Volume of the two specimens shall be determined and recorded. Volume determination shall
be by weighing the specimen to the nearest milligram in air and in distilled water at room
temperature, the difference being the weight of the water displaced by the specimen.
7. Air weight shall be taken with specimen in a tared bottle.
8. After weighing in water, the specimens shall be quickly dipped in alcohol to remove the water
and dried with a lint-free cloth.
9. Immediately after drying, each specimen shall be placed in a container and completely
immersed in 2.54 oz (75 ml) of the fluid specified in MIL-PRF-46176. Containers shall be
sealed to prevent vapor loss, placed in the oven and held at 248°F ± 5°F (120°C ± 3°C) for 70
hours.
10. At the end of the 70-hour period the specimens shall be removed from their containers, rinsed
in isopropyl alcohol or ethyl alcohol, wiped dry with a lint-free cloth, and the final physical
properties determined within 30 minutes after removal from the fluid, to determine
conformance to 3.4.4.
11. The method of determining physical properties after testing shall be the same as before
testing.
12. The weightings shall be the last operation before and the first operation after the immersion in
brake fluid and shall be accomplished without delay.
13. The increase in volume shall be calculated as follows:
(W3 -W4 )-(W1 -W2 )
Percent increase in volume =
X 100
(W1 -W2 )
=
initial weight in air.
Where:
W1
W2
=
initial weight in water.
=
final weight in air.
W3
=
final weight in water.
W4
c. Each of the remaining two specimens shall be placed in a container and completely immersed in
2.54 oz (75 ml) of the fluid specified in MIL-PRF-46176.
1. Containers shall be sealed to prevent vapor loss, placed in the oven and held at 248°F ± 5°F
(120°C ± 3°C) for 70 hours.
2. At the end of the 70 hour period, the containers shall be removed from the oven and with the
cups still in the fluid, shall be allowed to stand for 24 hours at room temperature.
3. The contents of the jar shall then be thoroughly agitated and transferred to a cone shaped
centrifuge tube and the volume of sediment determined in accordance with ASTM D91.
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