Bendix Commercial Vehicle Systems BRAKE SYSTEM TROUBLESHOOTING GUIDE - Manual (Page 19)

17
BRAKE SYSTEMS DIAGNOSTIC GUIDE
POTENTIAL CONDITION/CAUSE ACTION (SERVICE MANUAL SECTION)
Dragging brakes See DRAGGING BRAKES
Poor lining-to-drum contact. Linings are tapered
across width:
• Bell-mouthed drum
Replace drum (3)
• Bent brake spider Replace spider (3,6)
• Bent or stretched brake shoe Replace shoe (3,6)
• Loose wheel bearing Torque spindle nuts and check end play (6)
• Worn or damaged cam Replace cam (3,6)
Shoe-to-shoe variation:
• Mismatched lining friction codes
Replace lining(s) with proper friction code (5)
• Stretched shoe Replace shoe (3,6)
Brake components:
• Flat spots on cam or roller
Replace cam or roller (3,6)
• Worn anchor pin Replace anchor pin (3,6)
• Worn camshaft or bushings Replace camshaft and bushings (5)
Unequal wear on side-to-side brakes for same axle:
• Mismatched lining friction codes
Replace lining(s) with proper friction code (5)
• Seized or binding camshaft Clean and lubricate camshaft (2)
• Brake drum surface in poor condition Replace drum (3)
• Loose wheel bearing Torque spindle nuts and check end play (6)
• Performing downgrade braking using light drag Use snub method on downgrades
Slack adjuster not set properly:
• Incorrect installation of slack adjuster
Install slack adjuster properly (3,6)
• Incorrect in-service adjustment Check and correct adjustment procedure (2)
• Incorrect setup of external reference control arms Perform correct setup procedure (2)
(Eaton-Haldex)
• Broken or bent parts Replace damaged parts as required (3,6)
Wear on edge of lining:
• Wrong lining width
Replace lining (5)
• Wrong drum Replace drum (3)
• Loose bearing adjustment. Bearing spacer missing or too thin Replace spacer and torque spindle nuts. Check end
play (6)
PREMA
TURE LINING WEAR