Long stopping distances, Brake systems diagnostic guide – Bendix Commercial Vehicle Systems BRAKE SYSTEM TROUBLESHOOTING GUIDE User Manual
Page 11

9
BRAKE SYSTEMS DIAGNOSTIC GUIDE
POTENTIAL CONDITION/CAUSE
ACTION (SERVICE MANUAL SECTION)
Inadequate air supply to chamber:
• Old or broken lines
Replace chamber air lines (3)
• Pinhole leaks in air chamber line
Replace chamber air lines (3)
• Loose or damaged fittings
Tighten or replace fittings (3)
• Air line inner lining separation
Replace chamber air lines (3)
Separation:
• Plugged lines
Remove blockage
• Contamination
Remove contamination
Valve problems:
• Worn valves
Repair or replace
• Internal component failures
Repair or replace
• Seals/O-rings damaged
Replace seals/O-rings
• External vents blocked
Remove blockage
Governor failure:
• Incorrect set point
Correct set point
• Contamination
Remove contamination
• Damaged valve
Repair or replace
Compressor failure:
• Worn or leaking compressor
Repair or replace compressor
• Slipping/broken belts/drives
Repair or replace belts or drives
Contamination:
• No air dryer
Install air dryer
• Faulty air dryer
Repair or replace air dryer
• Dirty/damaged filter
Replace air filter
• Desiccant debris
Remove debris
• Incompatible oils
Drain and refill oil
Leaking air tanks
Repair or replace
Improperly set air chamber:
• Too much rod free-travel
Adjust brakes (2)
Slack adjuster improperly set:
• Incorrect installation of slack adjuster
Install slack adjuster properly (3,6)
• Incorrect in-service adjustment
Adjust brakes using correct procedure (2,6)
• Incorrect setup of external reference control arms
Perform correct setup procedure (3,6)
(Eaton-Haldex)
• Worn clevis pin
Replace clevis pin (3,6)
LONG STOPPING DIST
ANCES