Wear safety goggles when performing leakage
tests on valves. Failure to do so may result in
serious eye injury due to high pressure air.
Truck must be on level ground and wheels must
be chocked before parking brake is released.
Otherwise, truck may roll and cause injury
(1) Listen to air chamber and observe
brake shoe movement while assistant
releases and applies PARKING
BRAKE (TM 9-2320-364-10).
(a) If mechanic cannot hear air
chamber operate, chamber leaks
air or brake shoe does not move
when parking brake control valve
is pushed and pulled, perform
Step (2) below and replace
faulty air chamber (Para 12-10).
(b) If air chamber operates
correctly, perform Steps (2) below
and go to Step 6 of this Fault.
(2) Release PARKING BRAKE.
AIR CHAMBER TEST
(1) Measure gap between brake shoe and
drum (Para 12-2).
(a) If there is no gap, adjust brakes
(b) If there is a gap, perform Steps (2)
through (5) below.
(2) Cage air chamber (Para 12-10).
(3) Remove brake drum and air
chamber (Para 13-3 and 12-10).
(4) Inspect brake shoes and wedges
(a) If brake shoes and/or wedges are
faulty, replace brake shoes and/or
wedges (Para 12-2).
(b) If shoes and wedges are OK,
go to Step 7 of this Fault.
(5) Install brake drum and air chamber
(Para 13-3 and 12-10).