User's Manual
10
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 DISTANCES