Page K-17
Repair and Service Manual
B
B
MECHANICAL BRAKES
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Lubricate the backing plate friction points of the shoes
and moving anchor with Multi Purpose Grease (MPG)
lubricant (Ref. Fig. 21).
Fig. 21 Wheel Brake Lubrication Points
Install the actuator components, adjuster components
and brake shoes. See “Brake Shoe and Adjuster Replace-
ment” on Page M - 17 If the brake shoes and drum are not
to be replaced, sand the friction surfaces lightly with
emery cloth to remove any foreign material.
Be sure that the adjusting screw is screwed into the
star wheel nut until only 1 - 2 threads are exposed (Ref.
Fig. 24). If the brake shoes are replaced, replace the
three brake springs and the adjuster components.
Replace the springs one side at a time, using the other
side as a guide.
Install brake drum as described in ‘Brake Drum Removal
and Installation’.
Repeat on other side of vehicle.
Adjust the brake pedal free travel.
Backing Plate/Entire Wheel Brake Assembly
Removal and Installation
Remove the four bolts (1) and lock nuts (2) securing the
wheel brake backing plate to the flange (3) on the axle
tube (Ref. Fig. 22).
Fig. 22 Backing Plate Removal and Installation
Remove the clevis pin securing the brake cable to the
brake lever.
Installation is the reverse of removal. Connect the brake
cable to the wheel brake with the clevis pin installed
from the top down and a new cotter pin. Install the brake
assembly or backing plate to the axle tube flange. Install
new hardware (locknut should only be used once) and
tighten to 23 - 28 ft. lbs. (31 - 38 Nm) torque.
Brake Shoe and Adjuster Replacement
It is recommended that when brake shoes are replaced, the
adjusters and springs also be replaced. It is good practice to
do one side at a time, using the other side for reference.
Remove the three brake shoe springs and discard (1, 2,
3). Note the location of the heavy spring and the
adjuster spring (Ref. Fig. 23). Hold the shoe clamp pin
(4) and compress and rotate the shoe clamp (5) 90° to
release it from the shoe clamp pin. Remove the brake
shoes, adjuster and remaining components.
Clean the backing plate with a commercial brake
cleaner. Allow to dry completely. Lubricate the friction
points of the shoes and moving anchor with Multi Pur-
pose Grease (MPG) lubricant (Ref. Fig. 21).
Shim
Washer
Backing Plate
Lubricate
(3) Bosses
Each Side
Lubricate Surfaces In and Around
Slots and Plastic Slide Plate
(2) Teflon
Washers
Adjuster
Housing
Adjuster
Arm
DO NOT LUBRICATE
LUBRICATE
Moving Anchor
Actuator
Piston
Lubricate
(3) Bosses
Each Side
1
1
NOTICE
Summary of Contents for EXPRESS L6 2012
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