TM 9-2330-388-14
4-42.
Brake Air Chamber Test and Replacement of
b.
Removal.
(1) Open drain valves on the air reservoirs and
a.
Test.
(1) With towing vehicle connected and vehicle
(2) Disconnect two brake hoses from brake
brakes applied, coat the flanges and connections on the
air chamber with soapy water.
(3) Remove cotter pin and clevis pin securing
(2) Check for leakage indicated by bubbles.
clevis yoke to slack adjuster.
No leakage is permissible.
WARNING
securing brake chamber to bracket.
Discard
lockwashers.
DO NOT overtighten clamp on air chamber.
Maximum torque should be 20-25 lb-ft Over-
(5) Remove brake chamber.
tightening will distort the flange and cause
more leakage.
d.
Installation
(1) Place brake chamber in position on bracket,
secure brake chamber to bracket.
(4) Install clevis pin and cotter pin to secure
yoke to slack adjuster.
(5) Connect
two
brake
hoses
to
brake
chamber.
(6) Close drain valves on air reservoirs, fig. 4-
54.
(7) Pressurize air brake system and check for
Figure 4-48. Removing and Installing Brake Chamber
leaks.
(3) If leakage is found at flange, tighten the
WARNING
clamp. If leakage is found at connections, tighten
fittings.
DO NOT attempt to repair brake chamber fail-
(4) After initial brake application forced out a
spring Is highly compressed. No repair Is
small amount of air, no air should he expelled from the
authorized for fail-safe unit.
air chamber. If air continued to exhaust, replacement of
the brake chamber and fail-safe unit as an assembly is
necessary.
4-112