4-63. AIR CHAMBER MAINTENANCE.
This Task Covers:
c. Leakage Test
d. Pushrod Travel Test
q General mechanic's tool kit
Personnel Required: Two
Open pressure tank draincock (6) to release pressure in brake system.
Disconnect air line (5) from air chamber (2).
When removing air chamber, use caution not to damage master cylinder bellows.
Remove two nuts (9), Iockwashers (8), and air chamber (2) from bracket (1). Discard Iockwashers.
Install air chamber (2) on bracket (1) using two nuts (9) and new iockwashers (8). Ensure that air chamber
pushrod (3) is properly seated in master cylinder piston.
Apply antiseizing tape to male threads and connect air line (5) to air chamber (2).
Close pressure tank draincock (6).
Perform leakage test (subpara c).
Perform pushrod travel test (subpara d).
With semitrailer brake system fully charged and brakes applied, coat flange of air chamber (2) with detergent
and water solution and inspect for leakage. No leakage is permissible. if leakage is detected, tighten flange
nuts evenly and sufficiently,
Check nonpressure side of air chamber (2) for leakage by applying detergent and water solution to holes in air
chamber body. If leakage exists, replace air chamber.