Chevrolet 70 1969 Series, Shop Manual

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BRAKES 5A-22
PU LLS T O O N E SIDE (Cont'd.)
PROBABLE C A U S E
R E M E D Y
7. Wheel cylinder sticking. 7. Repair or replace wheel cylinder.
8 . W eak or broken retracting springs.
8. Check springs — replace bent, open-coiled or
cracked springs.
9. Out-of-round drums. 9. Resurface or replace drums in left- and right-
hand pairs (both front and both rear).
10. Brake dragging. 10. Check for loose lining. Adjust.
11. W eak chassis springs, loose U-bolts, loose
steering gear, etc.
11. Replace spring, tighten U-bolts, adjust steer­
ing gear, etc.
12. Loose steering. 12. Repair and adjust.
13. Unequal camber. 13. Adjust to specifications.
14. Clogged or crimped hydraulic line.
14. Repair or replace line.
15. Wheel cylinder size different on opposite sides.
15. Replace with correct cylinders.
16. Loose king pin. 16. Replace king pins or bushings.
17. Bad drum. 17. Refinish drums in pairs.
O N E W H E E L L O C K S
PROBABLE C A U S E R E M E D Y
1. Gum m y lining.
2. Tire tread slick.
1. Reline.
2. Match up tire treads from side to side.
W E T W E A T H E R : BRAKES G R AB O R W O N T H O L D
R E M E D Y
PROBABLE C A U S E
1. Linings too sensitive to water. 1. Reline.
2. Dirty brakes. 2. Clean out.
3. Bent backing plate.
3. Straighten.
4. Scored drums. 4. Grind or turn in pairs.
BR AKES S Q U E A K
PROBABLE C A U SE R E M E D Y
1
.
Backing plate bent or shoes twisted.
1
.
Straighten or replace damaged parts.
2 . Metallic particles or dust imbedded in lining. 2 . Sand the surfaces of the linings and drums. Re­
move all particles of metal that may be found in
the surfaces of the linings.
3. Lining rivets loose or lining not held tightly
against the shoe at the ends.
3. Replace rivets and/or tighten lining by re­
riveting.
4. Drums not square or distorted. 4. Turn or grind or replace drums.
5. Incorrect lining. 5. Replace lining.
6 . Shoes scraping on backing plate ledges. 6 . Apply brake lube to ledges. Replace with new
shoe and linings, if distorted.
7. W eak or broken hold down springs. 7. Replace defective parts.
8 . Loose wheel bearings. 8 . Tighten to proper setting.
9. Loose backing plate, drum, wheel cylinder. 9. Tighten.
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK S H O P M A N U A L