Figure 73. Brake master cylinder, installed on truck.

TM 10-3930-222-20

Figure 73. Brake master cylinder, installed on truck.

65. Brake Master Cylinder

(2) Remove the dust cover from the backing

plate.

(3) Insert a brake tool to engage the star

a. Removal.

wheel teeth.

(1) Remove the floor plates.

(4) Rotate the star wheel until the brakedrum

(2) Disconnect and tag the electric wires at

is locked.

the stoplight switch (fig. 73).

(5) Back off the star wheel until the

(3) Remove the cotter key and clevis pin and

brakedrum turns freely.

disconnect the master cylinder push rod

from the brake pedal assembly (fig. 73).

d. Inspection.

(4) Disconnect two hydraulic-lines at the

master cylinder.

(1) Inspect the brakedrums for worn or

grooved condition.

If defective, refer

(5) Remove the screws (9, fig. 76) nuts (14),

them to higher authority.

and lockwashers (13) that secure the

master cylinder body (10) to the truck and

(2) If the brake lining is worn to less than 1/8-

remove the cylinder.

inch thickness, replace the brakeshoes.

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