To determine whether the brake caliper is stuck, a comprehensive observation of multiple symptoms is required, including abnormal caliper retraction after braking, increased vehicle driving resistance, and abnormal brake system feedback. When the brake pedal is released, if there is still a noticeable drag on the wheels or abnormally increased resistance when pushing the vehicle, it may be caused by corroded caliper pistons or deteriorated seals preventing proper retraction. If the steering wheel pulls to one side during braking while driving, it typically indicates uneven braking force between the left and right calipers, requiring inspection of the wheel cylinder pistons for seizure. Additionally, sluggish pedal return accompanied by persistent braking force often indicates blockage in the caliper's hydraulic circuit or contaminated brake fluid. It is best to replace DOT4-compliant brake fluid every 2 years or 40,000 kilometres. If these symptoms are observed, promptly inspect the lubrication condition of caliper guide pins, piston seals, and brake pad retraction springs. When necessary, replace the repair kit or entire wheel cylinder to prevent increased fuel consumption or brake overheating failure due to dragging brakes. During routine maintenance, regularly clean calipers and inspect dust boot integrity. Particular attention should be paid to potential water ingress and corrosion of guide pins after rainy seasons.
