BRAKE CHAMBER (REAR WHEELS)
Relieve air system pressure by draining supply (depress pin in center of automatic drain valve), secondary,
and auxiliary air reservoirs.
There may be residual pressure in air lines after air reservoirs are
drained. Wear eye protection when disconnecting air lines to prevent
Back off counter nut (1) and unscrew brake chamber assembly (2) from wheel.
If necessary, remove connectors (3), adapters (4), washers (5), o-rings (6), and counter nut (1) from brake
chamber assembly (2).
Disassemble brake chamber assembly (2, Figure 2-4-8) as necessary to replace damaged, worn, and
Loosen clamps (7), and remove hose (8) and clamps (7) from elbow (24) and brake chamber
Brake chamber assembly is adjusted to have spring tension. Personal
injury may occur if tension is not released prior to removing clamp and
separating cover from cylinder.
Release spring tension on brake chamber assembly (2) by backing spring release bolt (9) out of
brake chamber cylinder (13) to a minimum length of 3.08 in. (78 mm) from back of chamber body to
top of bolt head.
Match mark cover (14) to brake chamber cylinder (13), remove nuts (10), capscrews (11), clamp
halves (12), and separate brake chamber cylinder (13) and cover (14).
Remove diaphragm (15) from brake chamber cylinder (13).
Remove piston (16) from cover (14).
Remove snap ring (17) and guide (18) from cover (14).
Remove o-ring (19) from guide (18).
Remove snap ring (20), bushing (21), and collar (22) from cover (14).
Remove rings (23) from collar (22).
(10) Remove elbow (24) from cover (14).