Chevrolet 70 1969 Series, Shop Manual

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BRAKES 5B-67
GENERAL TROUBLESHOOTING CHART
N O B R A K E S
P R O B A B L E CA U SE R E M E D Y
1. No air pressure
1. Check for leaks, broken lines, etc. Repair or
replace as necessary
2. Restricted tubing or hose
2.
Replace defective parts.
3. Defective brake valve
3. Repair or replace
IN SU F F IC IEN T B R A K E S
P R O B A B L E C AU SE
R E M E D Y
1. Low brake line pressure
1.
Check for leaks, etc. and repair
2. Too much push rod travel
2. Adjust
3. Worn linings or drums
3. Replace as necessary
4. Leaking chamber diaphragm
4. Replace diaphragm
5. Slack adjusters out of adjustment 5. Adjust
6. Wrong size brake chambers
6. Replace according to "Specifications”
S L O W B R A K E A P P L I C A T I O N
P R O B A B L E CAUSE R E M E D Y
1 . Low brake line pressure
1 . Check for leaks, etc. and repair
2.
Linkage binding 2. Lubricate linkage
3. Too much push rod travel
3. Adjust
4.
Restriction in line 4. Remove restriction or replace line
5. Leaking brake valve
5. Repair or replace
6. Worn linings or drums
6. Replace as necessary
7. Leaking chamber diaphragm
7. Replace diaphragm
8. Brake shoe anchor pins frozen
8. Free up, replace or lubricate as necessary
9.
Foot control valve linkage improperly adjusted
9. Adjust
10. Camshaft bushings binding or worn
10. Lubricate or replace
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SHOP M ANUAL