User's Manual
12
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