Chevrolet 70 1969 Series, Shop Manual

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BRAKES 5A-20
L IG H T P E D A L PRESSURE — BRAKES T O O S E V E R E
PROBABLE C A U SE R E M E D Y
1. Brake adjustment not correct. 1. Adjust the brakes.
2, Loose backing plate on front axle. 2. Tighten plates.
3. A small amount of grease or fluid on linings.
3. Replace the linings.
4. Charred linings.
4. Sand the surfaces of the linings.
5. Incorrect lining. 5. Install factory specified linings.
6.. Wheel bearings loose. 6. Adjust wheel bearings.
7. Lining loose on. shoe. 7. Replace lining or shoe and lining.
8. Excessive dust and dirt i.a drums.
8. Clean and sand drums and linings.
9, Bad drum. 9. Turn drums in pairs or replace.
B R A K E P E D A L T R A V E L D E C R E A S IN G
PROBABLE C A U SE R E M E D Y
1, Master cylinder compensating port plugged. L
Open, use air or ,015 wire. Remove any burr
in bore.
2. Swollen cup in master cylinder. 2. Replace rubber parts flush system. Refill with
recommended fluid.
3, Master cylinder piston not returning. 3. Rebuild master cylinder.
4. Weak shoe retracting springs. 4. Replace springs.
5. Wheel cylinder pistons sticking.
5. Clean cylinder bores and parts. Replace bad
parts.
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PU LSA T IN G BRAKE P E D A L
PROBABLE C A U SE R E M E D Y
1. Drums out-of-round. 1. Refinish drums.
2,
Loose brake drums on hub. 2, Tighten,
3. Worn or loose wheel bearings. 3, Replace or adjust.
4, Bent rear axle. 4. Replace axle.
BRAKES F A D E
PROBABLE C A U SE
R E M E D Y
i, Incorrect lining.
1. Replace lining with lining recommended.
2, Poor lining contact. 2. Grind lining to proper radius, adjust.
3. Thin drum. 3. Replace drum. j
4, Dragging brakes. 4, Adjust, j
CHEVROLET S F R E S 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L