Vehicle pulls / cracked drums, 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 brakes
See DRAGGING BRAKES
Check brake adjustment
Grabbing or pulling brakes:
• Grease, oil or dirt on linings
Replace linings (5)
• Glazed linings
Deglaze linings or replace (5)
• Cam bracket seal failure
Replace seals (5)
• Brake linings not a balanced set, different codes, or lining brand
Replace linings (5)
• Loose or broken linings
Replace linings (5)
• Brake drum out-of-round
Replace drum (3,6)
• Defective brake drum
Replace drum (3,6)
• Camshaft binding at one or more wheels
Clean and lubricate (2,3)
• Defective slack adjuster
Replace slack adjuster (3,6)
• Uneven brake adjustment (side-to-side)
Adjust brakes (2)
• Broken or bent part(s)
Replace part(s)(6)
• Loose spider or drum mounting bolts
Retorque bolts (6)
• Different air chamber size or slack adjuster length (side-to-side)
Use same size air chamber and slack adjuster length
on all brakes
VEHICLE PULLS/
CRACKED DRUMS