Air Disc Caliper Troubleshooting Guide

Fleet Products Ltd. · Air Disc Brakes

Air Disc Caliper Troubleshooting Guide

PDF Air disc caliper – troubleshooting guide Open document →

Air Disc Caliper Troubleshooting Table

PROBLEM POSSIBLE CAUSE POSSIBLE REMEDY
Brakes will NOT release Disc brake caliper bound up Lubricate or replace brake caliper
Brake hoses restricted Replace hoses
Brake control valve restricted/inoperable Repair/replace control valve
Brake out of adjustment Adjust brake/repair or replace automatic adjustment device as necessary
Damaged brake chamber Replace brake chamber
Damaged brake assembly Replace or repair brake assembly
Supply air interrupted Open glad hand cut-out cock or push brake control valve in
Supply line improperly coupled Properly couple supply air line
Brake pads frozen to rotor in cold weather Warm brakes
No brakes or insufficient brake performance Service air interrupted Open glad hand cut-out cock
Service air line improperly coupled Properly couple service air line
Brake hoses restricted Relieve restriction or obstruction or replace hoses
Brake control valve restricted/inoperable Repair/replace control valve
Brake out of adjustment Adjust brake/repair or replace automatic adjustment device as necessary
Damaged brake chamber Replace brake chamber
Damaged brake assembly Replace or repair brake assembly
Dragging Brakes/Slow brake application or release timing Brake hoses restricted Relieve restriction or obstruction or replace hoses
Brake control valve restricted/inoperable Repair/replace control valve
Brake out of adjustment Adjust brake/repair or replace automatic adjustment device as necessary
Damaged brake chamber Replace brake chamber
Damaged brake assembly Replace or repair brake assembly
Dog tracking Axle not properly aligned Align axle
Slider assembly racked or NOT aligned properly Repair or replace slider assembly
Frame bent or NOT aligned properly Repair or align frame
Damaged suspension component Repair or replace suspension component
Bent axle Replace axle
Uneven tire wear Improper tire inflation Inflate tire to proper pressure
Loose wheel stud nuts Inspect for and repair any resultant wheel end damage and tighten properly
Improper wheel bearing adjustment Inspect for and repair any resultant wheel end damage and adjust properly
Axle NOT properly aligned Align axle
Slider assembly racked or NOT aligned properly Repair or replace slider assembly
Frame bent or NOT aligned properly Repair or align frame
Damaged suspension component Repair or replace suspension component
Bent axle Replace axle
Mismatched tire sizes Properly match tire sizes
Unequal brake balance or timing Repair brakes as necessary
Overly aggressive braking Instruct/train driver in proper brake use
High speed turns Instruct/train driver in proper vehicle speeds
High level of side scrub Instruct/train driver in proper vehicle maneuvering
Anti-Lock Brake System malfunction Refer to ABS manufacturer’s service literature
Grabbing brakes Contaminants on brake lining Replace brake pads
Brake out of adjustment Adjust brake/repair or replace automatic adjustment device as necessary
Warped brake rotor Machine or replace brake rotor
Damaged brake chamber Replace brake chamber
Damaged brake assembly Replace or repair brake assembly
Unequal brake balance or timing Repair brakes as necessary
Anti-lock Brake System malfunction Refer to ABS manufacturer's service literature
Excessive heat cracks in rotor Brake out of adjustment Adjust brake/repair or replace automatic adjustment device as necessary
Overly aggressive braking Instruct/train driver in proper brake use
Unequal brake balance or timing Repair brakes as necessary
Anti-Lock Brake System malfunction Refer to ABS manufacturer's service literature
Damaged brake chamber Replace brake chamber
Damaged brake assembly Replace or repair brake assembly

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