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)
Slack adjuster not functioning properly:
• Bushing worn
Replace bushing (3,6)
• Spline damaged
Replace slack adjuster (3,6)
• Worn or damaged internal parts
Replace slack adjuster (3,6)
• Incorrect slack window (auto slacks)
Install correct window (3,6)
Overadjustment/underadjustment:
• Contamination of internal parts (auto slacks)
Replace slack adjuster (3,6)
• False feedback to slack adjuster due to degraded
Replace bad foundation brake component
foundation brake components (see below)
• Severely glazed or worn linings
Replace linings (5)
Degraded foundation brake components:
• Grease or oil on linings
Replace linings (5)
• Flat spots on cam or rollers
Replace cam or roller (3,6)
Camshaft bushings binding:
• lacks lubricant
Lubricate bushings
• Stretched shoe
Replace shoe (3,6)
• Other broken or bent parts
Replace damaged parts as required (3,6)
• Performing downgrade braking using light drag
Use snub method on downgrades
LONG STOPPING DIST
ANCES