Brake systems diagnostic guide – Bendix Commercial Vehicle Systems BRAKE SYSTEM TROUBLESHOOTING GUIDE User Manual
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BRAKE SYSTEMS DIAGNOSTIC GUIDE
POTENTIAL CONDITION/CAUSE
ACTION (SERVICE MANUAL SECTION)
Dragging brake
See DRAGGING BRAKES
Brake drum heat checked:
• Out-of-round brake drum
Replace drum (3)
• Eccentric mounting of drum
Correct as required (3)
• Loose wheel bearing
Correct as required
• Glazed linings
Deglaze or replace linings (5)
• Improper friction materials for vehicle type and vocation
Consult dealer for proper friction levels
• Overworked brake
Check brake balance (2)
• Driver abuse
Correct as required
• Wrong drum type
Replace with correct drum type (3)
• Defective brake lining
Replace lining (5)
• Debris between lining and drum
Clean, remove dirt and debris (3)
• Performing downgrade braking using light drag
Use snub method on downgrades
Excessive scoring of drum:
• Soft drum
Replace drum (3)
Excessive lining wear
See PREMATURE LINING WEAR
1.) Scoring
2.) Severe Heat Checking
(Drum cannot be turned to eliminate heat cracks)
3.) Cracking Through Hat Section
4.) Cracking Through Side Wall
VEHICLE PULLS/
CRACKED DRUMS