MECHANICAL BRAKES
Page M-17
Repair and Service Manual
Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notices, Cautions, Warnings and Dangers.
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 on the axle tube
(Ref. Fig. 23 on Page K-17).
Fig. 23 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 Removal
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.
Using a pair of pliers, compress the brake shoe retainer
springs (1) at the open end of the spring. While holding
the tension pin (2) with a second set of pliers, turn the
retainer spring 1/4 turn to align the slot in the spring
retainer with the flats in the tension pin. Remove the
brake shoe retainer springs.
Grasp the brake shoes (3) in the center and tilt them
outwards and away from the back mounting plate. This
will release the tension in the brake springs(4). Remove
the brake springs and remove the brake shoes (Ref. Fig.
27 on Page K-19).
Inspect brake shoes. If a brake shoe has less than 0.40
lining material thickness AT ANY POINT on either shoe
then both shoes MUST be replaced.
Check for free lateral (front and back) movement of the
adjusting mechanism and for free movement of the ’star’
wheel. Remove the boot on the brake lever. Clean any
accumulated brake dust from the backing plate and
adjuster mechanism using a brush or air hose.
If the brake is being removed for an axle bearing and
seal replacement, the four bolts and nuts securing the
brake assembly the brake assembly to the rear axle
must be removed. When reinstalling the brake mounting
bolts, tighten to 23 - 35 ft.lbs torque.
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. 22 on Page K-
16).
Brake Shoe Installation
The brake shoe end is pointed and engages the back-
side of the adjuster.There is a 17L stamped into brake
shoe (Ref. Fig. 24 on Page K-17).
Fig. 24 Brake Shoe ’17L’
1
2
NOTICE
17L