Air gap (disc brakes) and shoe clearance (drum brakes) determine how quickly a brake engages, how fully it releases, and whether it will drag. Adjustment methods vary by brake design, so always follow the manufacturer’s procedure. In general, you will: secure the machine, isolate power, confirm the brake is released/applied as required for adjustment, then set the clearance using adjustment bolts, eccentrics, or linkage settings.
Too small a gap can cause dragging, overheating, rapid lining wear, and reduced efficiency. Too large a gap can cause delayed engagement, reduced torque, and excessive actuator stroke—dangerous in emergency stopping or holding applications.
After adjustment, cycle the brake several times to ensure consistent motion, verify even contact on both sides, and re-check clearances. If the gap changes quickly after adjustment, inspect for worn pins/bushings, misalignment, weak springs, or warped discs/drums. Proper clearance is a stability factor for both braking performance and lining life.
