Brake dragging occurs when the brake does not fully release, causing continuous friction during operation. Signs include: abnormal heat at the brake housing, burning smell, reduced motor efficiency, unexpected power draw, rapid lining wear, discoloration of discs/drums, and sometimes squealing or rubbing sounds. In severe cases, dragging leads to brake fade and loss of holding torque due to overheating.
Common causes are incorrect air gap/clearance, seized pivots, misalignment, weak return springs, contaminated or swollen seals (hydraulic systems), low or unstable release pressure, or incorrect electrical supply for electromagnetic release.
Fixes start with safety lockout, then inspection and measurement: verify clearances, check actuator stroke and release pressure/voltage, lubricate or replace stuck pins/bushings, correct alignment, and replace contaminated linings. Also confirm the brake is sized correctly for the duty cycle—some systems “drag” because they are overheating from frequent stops and expanding components. A controlled functional test should follow any corrective work.
