TM 1-1520-238-23
3-222
3.58.
PARKING BRAKE MASTER CYLINDER DISASSEMBLY/ASSEMBLY (AVIM) – continued
(5) Apply 1500 psi to filler port (39). There must
be no external leakage.
(6) Remove pressure line (36). Install packing
(10) with cap (7).
e. Perform external leakage test.
(1) Remove plug (34) from port (35). Install pres-
sure line (36).
(2) Close shutoff valve (37). Apply load that will
generate 10 psi at brake port (35). Movement
of piston rod (13) indicates internal leakage.
Hold pressure 2 MINUTES.
(3) Increase and hold pressure at 75 psi. Move-
ment of piston rod (13) indicates internal leak-
age. Hold pressure 2 MINUTES.
(4) Increase and hold pressure to 750 psi. Move-
ment of piston rod (13) indicates internal leak-
age. Hold pressure 2 MINUTES.
(5) Reduce pressure to zero. Fully compress cyl-
inder (3). Piston rod (13) must extend
smoothly and rapidly while pressure drops to
zero at full extension.
(6) Remove pressure line (36).
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3
35
37
36
39
34
13
TEST FIXTURE
PRESSURE
SOURCE
GAGE
M04-2953-20
