Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
25
Repair and Service Manual
699322
BRAKE SYSTEM
Figure 1 Mechanical Brake System
General Description
This vehicle is equipped with a mechanically activated
rear drum brake system. The brake system consists of a
service brake and parking brake pedal, parking brake
release linkage, compensator assembly, equalizer link,
brake cables and self adjusting wheel brake assemblies
(Figure 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 clip-
pings, tree roots and other objects can cause corrosion
and physical damage to the brake components. Unlike
automotive 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 can-
not travel far enough to absorb the slack (free travel) in
the system and still apply the shoes to the drums, the
braking 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 (Figure 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 cables.
Each brake cable pulls a brake lever which pushes the
rear brake shoe against the brake drum. When the rear
Brake Cables
Retaining Ring
Cotter Pin
Clevis Pin
Brake Lever
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
Self Adjusting
Wheel Brake
Содержание LS2 2020
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