Chevrolet 10 Series 1968, Service Manual

Page: 311 / 713

BRAKES 5-68
sure all slack adjusters return to released position freely
without binding.
With brakes released, make sure the angle formed by
slack adjuster arm and brake chamber push rod is
greater than 90 degrees. All slack adjusters should be
set at the same angle. With brakes applied, make sure
the angle formed by the slack adjuster arm and brake
chamber push rod is still slightly greater than 90 degrees
and that all are at the same angle. If angle is less than
90 degrees with brakes applied, slack adjuster is going
"over center." Adjust brakes as previously described
under "Brake Adjustments."
BRAKE SHOES AND CAMSHAFTS
(Figs. 102, 103, 104 and 105)
Removal
Front
1. Remove wheel nuts, rim locks and rim and tire
assembly.
2. Remove cotter pin, spindle nut, spacer and outer
bearing.
3. Remove wheel and brake drum assembly.
4. Remove brake shoe pull back springs.
5. Remove cam rollers.
6. Remove
" C "
washers, flat washers and wave washers
from each hold down stud.
7. Remove brake shoe hold down nuts, washers and
anchor pin "horseshoe" clips.
8. Remove brake shoes.
9. Remove snap ring from end of camshaft and remove
spacers.
10. Tap out camshaft (fig. 103).
Rear
1. Remove wheel nuts, rim locks, and outer tire and
rim assembly.
2. Remove rim spacer, then inner rim and tire
assembly.
3. Remove axle shaft retaining nuts and "split wedge"
locks.
4. Withdraw axle shaft.
5. Remove axle shaft lock nut, lock, and adjusting nut.
6„ Remove wheel and brake drum assembly, being
careful not to damage outer bearing.
7„ Slip shoe return spring off of pins on inside of brake
shoes. See Figure 104 for parts identification.
1. Cam (Integral with
Shaft)
2 . Spacing Washers
3. Seal
10
.
F ig . 1 0 5 -A ir Brake Camshaft Assembly
Camshaft
Camshaft and Brake
Chamber Bracket
Spacer
Bushing
Flange Plate
Camshaft Bracket
Seal Retainer
11. S la ck Adjuster
12. Lock Ring
13. S la ck Adjusting
Nut
CHEVROLET TRUCK SERVICE MANUAL