B
26
Repair and Service Manual
BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
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shoe contacts the brake drum, it can no longer move rear-
ward. Additional pedal (and cable) travel causes the actu-
ator bracket (moving anchor) to move and applies force to
the front shoe, pushing it against the brake drum. The
force applied to the front and rear shoes is approximately
equal. As the shoes contact the moving brake drum, the
shoes try to move in the direction of drum rotation. This
movement results in the typical brake shoe wear patterns.
Equalizer Link
The equalizer link balances braking between the driver
and passenger sides of the vehicle. Variations in wheel
brake adjustment, cable friction and manufacturing toler-
ances may cause the equalizer to be slightly misaligned.
This misalignment is normal.
Automatic Adjuster Mechanism
Never manually adjust the brakes at
the star wheel. Doing so will cause
permanent damage to the adjuster
assembly and result in a gradual
loss of brakes.
The wheel brakes are equipped with an automatic
adjuster mechanism that is designed to compensate for
brake shoe wear and eliminate the need for manual brake
shoe adjustment. The brake adjuster is activated by
movement of the lever attached to the brake cable.
How the Parking Brake Works
The parking brake is operated by a smaller pedal which
extends across the top of the service brake pedal. It is
attached to the service brake pedal with a hinge pin and
is spring loaded (Figure 2).
Pressing the parking brake pedal moves the latch arm
against the catch bracket attached to the chassis. As the
parking brake is pressed, the service brake is applied
until the notch in the latch arm engages with the catch
bracket. The service brake pedal is held in the applied
(down) position by the catch bracket.
Figure 2 Parking Brake and Kick-Off Mechanism
The latch arm is held in position by the tension in the
brake linkage. The Parking Brake can be released by two
methods:
1.
Pressing the service brake, which permits the spring
loaded Parking Brake pedal to return to its original
position, disengaging the latch arm from the catch
bracket. This is the preferred method which mini-
mizes wear on components.
2.
Pressing the accelerator pedal rotates the kick-off
cam which forces the pedal latch arm to move away
from the catch bracket. The spring loaded Parking
Brake pedal returns to its original position, releasing
the brake.
Pedal
Latch
Arm
Accelerator
Pedal
Pedal Latch Arm
Kick-Off Cam
Pedal Bumper
Catch
Bracket
