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TROUBLESHOOTING
PROBLEM
SINGLE BRAKE DRAGGING OR
LOCKED
UNEVEN BRAKES
BRAKES APPLY TOO SLOWLY
BRAKES RELEASE TOO SLOWLY
ALL BRAKES DO NOT RELEASE
INSUFFICIENT BRAKES
5-4
PROBABLE CAUSE
Broken internal brake component
Flat spot on cam roller or cam shaft
Improper adjustment
Spider bushing or cam bracket bushing
binding
Improper lubrication
Worn brake shoe bushing
Brake drum distortion
Broken brake chamber spring
Brake chamber pushrod binding
Air brake line loose or broken
See "SINGLE BRAKE DRAGGING OR LOCKED"
Restriction in hose
Worn brake linings
Grease on linings
Broken slack adjuster
Leaking brake chamber diaphragm
Brakes need adjusting or lubrication
Low air pressure in brake system (below
105 PSI)
Restricted tubing or hose
Defective relay valve
Brakes need adjusting or lubrication
Brake rigging binding
Exhaust port or relay valve restricted or
plugged
Tractor pressure too low
Air system improperly connected to tractor
Brake valve on tractor is applied
Relay emergency valve in emergency
position
Restricted tubing or line
Defective tractor protection valve
Parking brakes locked
Tractor pressure too low
Brakes need adjusting
Brakes need lubricating
Brakes need relining
Low air pressure
Defective relay emergency valve
Brakes overheeated
SOLUTION
Locate and replace broken part (See
"Brake Assembly Maintenance" on
page 4-15.)
Replace and lubricate
Adjust slack adjusters (See "Automatic
Slack Adjusters" on page 4-17.)
Lubricate or replace bushing
Lubricate per Figure 4-1
Replace bushing (See "Brake Assembly
Maintenance" on page 4-15.)
Replace drum
Replace spring
Re-align brake chamber bracket
Tighten or repair
Locate restriction and remove
Reline brakes
Reline brakes
Replace slack adjuster (See "Replacing
Slack Adjuster" on page 4-18.)
Replace diaphragm
Adjust or lubricate as needed
Check tractor air system
Locate restriction and remove
Clean or replace
Adjust or lubricate as needed
Align brakes or replace bent parts
Clean valve
Adjust to provide 105 psi min.
Tighten or adjust connections
Release brake
Check line pressure and check valve
Locate restriction and remove
Troubleshoot tractor air system
Troubleshoot air system
Adjust to provide 105 psi min.
Adjust brakes (See "Brake Adjustment"
on page 4-15.)
Lubricate brakes
Reline brakes
Troubleshoot air system
Repair or replace
Stop and allow brakes to cool, locate
cause of overheating
F-563-0610 Edition
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