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Symptom
System does not reach operating
pressure
Ineffective park brake
Ineffective service brakes
Ineffective engine valve brake
Increased stopping distances
Squealing noise from the brakes
when applied
Cab lifts in the air when brakes are
applied
Machine lacks power
120
Brake System Troubleshooting
Possible Cause
Leaks in the hoses/fittings
Manual drain valve is open
Defective pressure gauge
Defective park brake valve
Leaks in the hoses/fittings
Leaks in hoses/fittings
Worn brake pads
Oil or grease on the brake pads
Brake pads glazed
Brake pads warped or scored
Only front brakes are functional
No air in rear reservoirs
Filter in constant pressure line
blocked
Remedy
Repair leak. Contact your BELL
Product Support Representative
Install new drain valve. Contact your
BELL Product Support Representa-
tive
Install new gauge. Contact your
BELL Product Support Representa-
tive
Install new park brake valve. Con-
tact your BELL Product Support
Representative
Repair leak. Contact your BELL
Product Support Representative
Contact your BELL Product Support
Representative
Change the brake pads. Contact
your BELL Product Support Repre-
sentative
Change the brake pads. Contact
your BELL Product Support Repre-
sentative
Change the brake pads. Contact
your BELL Product Support Repre-
sentative
Change the brake pads. Contact
your BELL Product Support Repre-
sentative
Check the brake fluid
Check the rear air reservoirs for air
pressure
Change the filter. Contact your
BELL Product Support Representa-
tive
June 1, 1999
870984-01
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