Chevrolet Light Duty Truck 1973 Service Manual page 323

Probable Cause
1. Shoe h i t s drum.
2. Bent shoe web.
3. Foreign m aterial in l i n i n g .
4. Rivets or shoe rubbing drum.
5. L inin g charred.
6. Rough drum surface.
Probable Cause
1. I n c o r r e c t t i r e pressures.
2. Front end out o f 1ine.
3. Unmatched t i r e s on same a x le .
4. R e stric te d brake tubes or hoses.
5. M a lfu nc tio nin g c a l i p e r assembly.
6. D e fe ctiv e or damaged shoe & l i n i n g (grease or brake
f l u i d on l i n i n g or bent shoe).
7. M alfu n ctio n in g rea r brakes.
8. Loose suspension p a rts .
9. Loose c a l ip e r s .
Probable Cause
1. Excessive l a t e r i a l runout.
2. P a ra lle lis m not w i t h i n s p e c if ic a t i o n s
3. Wheel bearings not adjusted c o r r e c t l y
DIAGNOSIS—DRUM BRAKES
G R IN D IN G NOISE
DIAGNOSIS—DISC BRAKES
PULLS
BRAKE ROUGHNESS OR CHATTER (PEDAL PULSATES)
Rem edy
1 Switch drums or grin d drums.
.
2. S tra ig h te n .
3. Remove.
4. Reline - r e f i n i s h drums, i f scored.
5. Replace the 1in in g s .
6. R e finis h drums.
Rem edy
1 I n f l a t e evenly on both sides to the recommended
.
pressures. (See owner's manual.)
2. Check and a l i g n to m an ufac ture r's s p e c i f i c a t i o n s .
3. T ires w ith approxim ately the same amount o f tread
should be used on the same a x le .
4. Check f o r s o f t hoses and damaged l i n e s .
new hoses and new double -w alled stee l brake tu b in g .
5. Check f o r stuck or slu gg is h p is to n s .
6.
I n s t a l l new shoe and l i n i n g on complete a x le .
7. Check f o r in o p e r a t iv e automatic a d ju s tin g
mechanism, d e f e c t iv e l i n i n g (grease o r brake f l u i d
on l i n i n g ) or d e f e c t iv e wheel c y l i n d e r s .
as necessary.
8. Check a l l suspension mountings.
9. Check and torque a l l b o lt s to s p e c i f i c a t i o n s .
Rem edy
1 Check per i n s t r u c t i o n s and resurfa ce the r o t o r , i f
.
w i t h i n s p e c i f i c a t i o n s .
2. Check per i n s t r u c t i o n s and res u rfa ce the r o t o r , i f
w i t h i n s p e c i f i c a t i o n s .
3. A d ju st wheel bearings to c o r r e c t s p e c i f i c a t i o n s .
BRAKES 5 -5 7
Replace w ith
Repair
not
not
LIGHT DUTY TRUCK SERVICE MANUAL