Section IV. REPAIR OF SERVICE BRAKES

e. Installation. Install the rear axle assembly by

(3) Turn the steering wheel full right and

measure the angle of travel of the wheels. The right

reversing the removal procedure. Tighten the axle

wheel must have rotated 54 to 56 and the left

mounting housing capscrews to a torque of 125 to

wheel, 75 to 80. Adjust the left stop bolt of the

135 ft lbs.

f. Adjustment.

pivot arm to obtain correct rotation. Turn the

steering wheel full left and repeat the adjustment

(1) Raise the rear of the truck so the steer

using the right stop bolt.

wheels clear the floor and block the truck securely

in position.

(4) Start the engine and check the operation of

the steering system. When all adjustments are

(2) Position the steer wheels straight ahead,

correct, the stop bolts on the pivot arm should

parallel with the side of the truck frame. Measure

contact the axle before the piston bottoms at either

the distance between the centers of the steer wheel

treads, at the rear of the tires and at the front of the

end of the power steering cylinder.

tires. The measurements should be equal. If they

(5) Stop the engine and lower the truck to the

floor.

are not. a d j u s t t h e t i e r o d s t o o b t a i n e q u a l

measurements (zero toe-in ).

Section IV. REPAIR OF SERVICE BRAKES

4-10. General

b. Disassembly.

(1) Secure the master cylinder in a vise. Be

The hydraulic brake system consists of a master

careful not to tighten the vise excessively, which

cylinder, lines, two wheel cylinders, shoes, and

could distort the cylinder or crack the casting.

related parts. The brake components at the wheels

(2) Remove the boot (1, fig. 4-19) and the

arc located between dust shields at each drive

push rod (2).

wheel. The wheel cylinders are double-end type.

(3) Pry out the lock ring (3) holding the

They transfer movement through links to the

piston assembly (6) in position.

bottom of the brake shoes. The top of the brake

(4) Carefully remove the plate (4), seal (5),

shoes move freely against wear plates, held there

piston assembly (6), cup (7), retainer (8), spring

only by the tension springs. The brakes are self

(9), valve (10), and the seal (11).

adjusting, with a friction slide assembly in each

(5) Working from the other end of the

wheel. The friction in the slide assembly is great

cylinder. remove the bolt (12). copper gaskets (13),

enough to prevent the springs from collapsing it,

and fitting (14).

but not great enough to prevent wheel cylinder

(6) Remove the filler cap (15) and gasket (16)

pressure from expanding it.

from the body (17).

4-11. Master Cylinder

a. Removal. Refer to TM 10-3930-624-12.

4-20