User's Manual

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 DISTANCES