Chevrolet Light Duty Truck 1973 Service Manual page 322

5 -5 6 BRAKES
Probable Cause
1. I n c o rr e c t l i n i n g to drum cle arance.
2. Loose fla n g e p la t e .
3. Grease, f l u i d , road dust on l i n i n g .
4. Weak or broken r e t r a c t o r s p rin g .
5. Loose wheel bearings.
6. Drums o u t-o f-ro u n d .
7. Cocked or d i s t o r t e d shoes.
8. Tapered or barrel-shaped drums.
Probable Cause
1. Shoes l i f t o f f fla n g e p l a t e and snap back.
2. Hold down springs weak.
3. Shoe bent.
4. Grooves in fla n g e p l a t e pads.
Probable Cause
1. Grooved fla n g e p la t e pads.
2. Lack o f l u b r i c a t i o n on moving p a r ts .
3. Loose drums or fla n g e p la t e s .
4. Loose or worn f r o n t end p a rts .
Probable Cause
1. Too much clearance between shoes and anchors.
2. R e tra c to r springs unequal - weak.
DIAGNOSIS—DRUM BRAKES
BRAKES CHATTER
1,. Readjust to recommended cle arances.
2,. Tighten s e cu re ly.
3.. Clean ou t d u st; repla ce grease and f l u i d soaked l i n i n g s .
4,. Replace.
5,. Readjust.
6,. Grind or tu rn drums in p a ir s .
7,. S tra ig h te n or rep la c e.
8,. Grind or tu rn in p a ir s .
SHOE CLICK
1. Change drums sid e to sid e or g rin d drums ( i n p a i r s ) .
2., Replace s pring s.
3., S tra ig h te n .
4. Grind - lu b r i c a t e w ith Delco Brake Lube #5450032 (or
SNAPPIN G NOISE IN FRONT END
1 . Grind pads or repla ce fla n g e p l a t e .
2.. Lu brica te a l l rubbing po in ts w ith Delco Brake Lube
3.. Tig hte n.
4., Tighten or repla ce d e f e c t iv e p a r ts .
TH U M P IN G NOISE W HEN BRAKES ARE APPLIED
1
.
2. Replace sp rin g s.
Remedy
Remedy
e q u i v a l e n t ) .
Remedy
#5450032 (or e q u iv a le n t ) .
Remedy
A d ju st.
LIGHT DUTY TRUCK SERVICE MANUAL