SM 1962 4-00
Section 165-0010
1
BRAKE PARTS - Brake Parts - Rear
SM - 048
DESCRIPTION AND OPERATION
The service brakes are of the calliper disc-type. The
calliper brake head is designed for use with hydraulic
brake fluid. The head is bolted to a mounting plate on
the axle housing. The disc is bolted to the wheel. There
is one brake head and one brake disc at each wheel.
Each calliper brake head assembly consists of a
torque plate, two brake pads, one on each side of the
brake disc, and four brake pistons, two on each side
of the brake disc.
The brake is actuated by hydraulic brake fluid
entering the brake head through one of the bleeder
ports. The piston bores on each side of the torque
plate are interconnected by internal passages.
When the brake is actuated, the hydraulic pressure
forces the pistons against the brake pads which are,
in turn, forced against each side of the brake disc,
slowing or stopping the disc and wheel rotation.
GENERAL INSPECTION
1. Inspect brake pads for wear. If the brake pad
friction material is worn down to 3 mm (0.12 in)
thickness, the pads must be replaced.
2. Inspect brake disc as follows:
a. Measure original thickness of disc at outside
diameter (this area is not contacted by brake pad
friction material).
b. Measure thickness of disc at three points on the
brake pad friction material contact circumference and
determine the average disc thickness.
c. Subtract 'b' from 'a'. If difference is 3 mm (0.12 in)
or greater, the disc must be replaced.
Note: Refer to Section 160-0030, AXLE GROUP
(HUB), for brake disc replacement instructions.
Fig. 1 - Cutaway View of Typical Brake Head and Disc Mounting
1 - Capscrew
2 - Brake Disc
3 - Brake Heads
4 - Bolt
5 - Washer
Courtesy of Machine.Market
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