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BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
65
Repair and Service Manual
634756
BRAKES
Fig. 1 Mechanical Brake System
BRAKE SYSTEM OVERVIEW
General Description
This vehicle is equipped with a mechanically activated
rear drum brake system. The brake system consists of a
service brake and park brake pedal, park brake release
linkage, compensator assembly, equalizer link, brake
cables and self adjusting wheel brake assemblies (Ref.
Fig. 1).
Although the brake system is similar to an automobile, it
is different in important ways. The system operates in a
very severe environment. Fertilizer, dust, grass clippings,
tree roots and other objects can cause corrosion and
physical damage to the brake components. Unlike auto-
motive hydraulic brakes, mechanical brakes depend on
the travel of the brake cables to move the brake shoes
against the brake drums. The travel of the brake cables
is governed by the brake pedal. If the cables cannot
travel far enough to absorb the slack (free travel) in the
system and still apply the shoes to the drums, the brak-
ing effort at the wheel brake will not be adequate. The
self adjusting mechanism in the wheel brakes requires
enough cable travel at the wheel brake to work reliably.
When the brake is released, there must be slack in the
system so the brakes will release fully and the adjusters
will function. Free pedal travel, pedal force, shoe to drum
clearance and braking capability are closely related. It is
very important to maintain the proper relationships to
assure braking performance and the best wheel brake
adjustment.
How the Service Brake Works
Pressing the service brake pedal pulls the compensator
assembly and equalizer link, which are connected to the
brake cables (Ref. Fig. 1). The first part of the pedal
travel removes slack from the system. Continued motion
of the brake pedal pulls both the left and right brake
Brake Cables
Retaining Ring
Cotter Pin
Clevis Pin
Brake Lever
Self Adjusting
Wheel Brake
Spherical Nut
Jam Nut
Brake Pedal Pivot Bolt
Compensator Assembly
Pedal Latch Arm
Kick Off Cam
Torsion Springs
Washers
Bushing
Cam Pivot
Spacer
Torsion Spring
Cap Screw
Set Screw
Pedal Bumper
Nylock Nut
Identification
Hole*
Park Brake Pedal
Catch Bracket
Part of Frame
Park Brake
Release Linkage
Part of
Accelerator
Pedal
Push Nut
Hinge Pin
Service Brake Pedal
Lock Nut
Bushing
Equalizer Link
NOTE:
Bottom pull brake drum
shown; some models
are top pull. They are
functionally the same.