TRUCK SERVICE MANUAL
BRAKES-AIR
SERVICING DUST SHIELDS
A.
Welded on spider brakes have dust shields of
the four-piece type attached to the spider with
capscrews and lockwashers. Either one or all
of the sections can be removed directly from
the brake by removing the capscrews and
lockwashers.
B.
Most bolted on spider brakes with two-piece dust
shields can be serviced as described in
paragraph "A" after removing wheels, drums
and brake shoes.
C.
Bolted on spider brakes with one-piece dust
shields will have to be taken off the vehicle for
servicing. To remove dust shield from brake
first remove power units then remove shield to
Remove brake shoe assemblies. DO NOT remove
spider capscrews and lockwashers.
The
brake shoe hold down clip, support bracket, lockwashers
shields can be replaced with a one or two piece
and capscrews, or wear buttons unless in need of
dust shield D. On backing plate mounted
service.
brakes the backing plate serves. as a support
2.
Remove dust shield, cotter key and nut from
for the plunger housing and anchor block as
brake shoe guide pin. Remove guide pin,
well as a dust shield.
For servicing the
spring and washers. Lift brake shoe out of
complete backing plate will have to be taken off
plunger slots, and tilt brake shoe to unhook the
the vehicle by removing the plate to spindle
return springs.
flange bolts, nuts and lockwashers.
ASSEMBLE SHOES ONTO BRAKE:
SERVICING BRAKE SHOES
A.
If necessary, reline brake shoes. Apply film of
grease to the shoe rest pads and the plunger
REMOVE SHOES
and bolt slots.
Caution:
Do not use
NOTE: If necessary back off shoes away from drum
combination linings.
manually by turning adjusting bolt assemblies.
B.
Rotate adjusting bolts to align slots in bolt
B.
Remove wheel, hub and drum assemblies.
retainer with brake shoe webs, being certain
C.
Remove brake shoe return springs, using one of
that bolts are not bottomed in adjusting
the following two methods:
plungers.
"COIL" RETURN SPRING
C.
Assemble brake shoes in reverse manner in
1.
Use brake spring pliers.
(DO NOT use
which they were disassembled. Be sure that
screwdriver.) On backing plate mounted brakes, remove
the long radius of the shoe web fits into slot in
the anti-rattle rod assembly by pushing on rod head on
adjusting bolt retainer, and that the arrow
back side, while depressing spring and cap. Turn cap
stamped on the brake shoe web points to the
Y4 turn and remove caps, spring and rod.
anchor plunger in forward wheel rotation. See
page 199 for correct position of brake shoes
and plungers.
D.
Install brake drums and adjust brakes.
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