5 - 5 8 BRAKES
DIAGNOSIS—DISC BRAKES
BRAKE ROUGHNESS, ETC. (C O N T .)
Probable Cause
Remedy
4. Rear drums o u t - o f - r o u n d .
4. Check runout and i f not w i t h i n s p e c i f i c a t i o n s , t u r n the
drums.
(Not over maximum o f .060 on the d ia m e te r .)
5. Shoe reversed ( s t e e l a g a in s t i r o n ) .
5. Replace r o t o r and shoe and l i n i n g .
EXCESSIVE PEDAL EFFORT
Probable Cause
Remedy
1. M a lfu n c tio n in g power brake.
1
.
Check power brake and r e p a i r i f necessary.
2. P a r t i a l system f a i l u r e (dual master c y l i n d e r ) .
2. Check f r o n t and r e a r brake system and r e p a i r i f
necessary.
Also check brake warning l i g h t i f a f a i l e d
system is found and l i g h t did not f u n c t i o n .
3. Excessively worn shoe and l i n i n g .
3. Check and repla ce in a x le s e ts .
4. Pistons in c a l ip e r s stu ck o r s lu g g is h .
4. Remove c a l ip e r s and r e b u i l d .
5. Fading brakes due to i n c o r r e c t l i n i n g .
5. Remove and re p la ce w ith o r i g i n a l equipment.
EXCESSIVE PEDAL TRAVEL
Probable Cause
Remedy
1. P a r t i a l brake system f a i l u r e (w ith dual system master
c y l i n d e r s ) .
1
.
Check both f r o n t and r e a r systems f o r a f a i l u r e and
r e p a i r .
Also check warning l i g h t , i f v e h ic le is so
equipped.
I t should have in d ic a te d a f a i l u r e .
2. I n s u f f i c i e n t f l u i d due to le ak in system.
2. F i l l r e s e r v o ir s w i th GM Hydraulic Brake F lu id Supreme
No. 11 (or e q u i v a l e n t ) .
3. I n c o r r e c t master c y l i n d e r push rod adjustment.
3. A d ju s t c l e v i s where p o s s ib le .
4. A i r trapped in system.
4. Bleed system.
5. Rear brake not a d ju s tin g p r o p e r ly .
5. A d ju s t r e a r brakes and r e p a i r auto a d ju s te r s .
6. Bent shoe and l i n i n g .
6. Replace a x le s et o f shoe and l i n i n g .
D R A G G IN G BRAKES
(A very l i g h t drag is present in a l l dis c brakes immediately a f t e r pedal is released)
Probable Cause
Rem edy
1. Master c y li n d e r pisto ns not r e t u r n in g c o r r e c t l y .
1
.
With r e s e r v o i r cover o f f , check f o r f l u i d s p u r t a t bypass
holes as pedal is depressed.
A d ju s t push ro d, i f
necessary or r e b u i ld master c y l i n d e r .
2. R e s tr ic te d brake tubes or hoses.
2. Check f o r s o f t hoses or damaged tubes and re p la ce w ith
new hoses and new do ub le-walled ste e l brake t u b in g .
LIGHT DUTY TRUCK SERVICE MANUAL
Summary of Contents for Light Duty Truck 1973
Page 1: ......
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Page 53: ...HEATER AND AIR CONDITIONING 1A 27 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 115: ...LIGHT DUTY TRUCK SERVICE M A N U A L HEATER AND AIR CONDITIONING 1A 89...
Page 123: ...BODY 1B 3 Fig 6 Typical 06 Van LIGHT DUTY TRUCK SERVICE MANUAL...
Page 149: ...BODY 1B 29 Fig 84 Body Mounting 06 Fig 85 Body Mounting 14 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 171: ...LIGHT DUTY TRUCK SERVICE M A N U A L Fig 2 Frame Horizontal Checking Typical FRAME 2 3...
Page 173: ...LIGHT DUTY TRUCK SERVICE M A N U A L Fig 4 10 30 Series Truck Frame FRAME 2 5...
Page 174: ...2 6 FRAME LIGHT DUTY TRUCK SERVICE MANUAL Fig 5 Underbody Reference Points G Van...
Page 185: ...FRONT SUSPENSION 3 11 Fig 16 Toe out on Turns LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 351: ...ENGINE 6 15 Fig ID Sectional View of Eight Cylinder Engine LIGHT DUTY TRUCK SERVICE MANUAL...
Page 375: ...EN G IN E 6 39 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 376: ...6 4 0 ENGINE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 377: ...ENG IN E 6 41 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 378: ...LIGHT DUTY TRUCK SERVICE MANUAL Fig 37L K Series Engine Front Mount 6 42 ENG INE...
Page 400: ...6 6 4 ENG INE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 401: ...ENG IN E 6 65 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 402: ...6 6 6 ENGINE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 403: ...E NG IN E 6 67 Fig 36V C Series Engine Mounts LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 423: ...EN G IN E C OOLING 6K 13 Fig 16 Overheating Chart LIGHT DUTY TRUCK SERVICE MANUAL...
Page 424: ...6 K 1 4 ENG INE COOLING Fig 17 Coolant Loss Chart LIGHT DUTY TRUCK SERVICE MANUAL...
Page 456: ...6M 32 ENGINE FUEL Fig K15 Accelerator Controls G Van L 6 LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 512: ...Fig 18e Vacuum Advance Diagram V8 Engine...
Page 516: ...6 T 2 4 E M IS S IO N CONTROL SYSTEMS LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 593: ...CLUTCHES MANUAL TRANSMISSIONS 7M 3 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 598: ...7M 8 CLUTCHES MANUAL TRANSMISSIONS LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 743: ...FUEL TANKS AND EXHAUST 8 13 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 744: ...8 14 FUEL TANKS AND EXHAUST LIGHT DUTY TRUCK SERVICE MANUAL...
Page 760: ...8 30 FUEL TANKS AND EXHAUST Fig 40 Exhaust Pipe P Models LIGHT DUTY TRUCK SERVICE MANUAL...
Page 761: ...FUEL TANKS AND EXHAUST 8 31 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 763: ...FUEL TANKS AND EXHAUST 8 33 LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 832: ...LIGHT DUTY TRUCK SERVICE MANUAL Fig 106 Power Steering Pump Mounting Typical 9 66 STEERING...
Page 833: ...PUMP ASSEMBLY STEERING GEAR TYPICAL SMALL V8 TYPICAL LARGE V8 STEERING 9 67...
Page 861: ...STEERING 9 95 Fig 134 Power Steering Pump Leakage LIGHT DUTY TRUCK SERVICE MANUAL...
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Page 886: ...11 10 CHASSIS SHEET METAL LIGHT DUTY TRUCK SERVICE MANUAL...
Page 891: ...ELECTRICAL BODY AND CHASSIS 12 5 LIGHT DUTY TRUCK SERVICE MANUAL...
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