What to Do When the Brake Piston Doesn't Retract?
2 Answers
Here are the solutions for a brake piston that doesn't retract: 1. Stuck Brake Caliper Piston: A stuck brake caliper piston can cause braking resistance, keeping the caliper stationary. When braking, the caliper clamps the brake disc to perform the braking action. If the caliper is stuck, not only will the brake pedal fail to retract, but the car will also be unable to move forward, requiring the replacement of the brake caliper. 2. Incorrect Rear Axle Bearing Fixation: If the rear axle bearing is fixed or installed incorrectly, it can lead to wear, dryness, or damage of the rear wheel bearing. A car has four wheels, each connected to the body via bearings. If the bearings are misaligned, the entire vehicle body becomes uncoordinated, potentially causing the brake pads to be in an improper position, resulting in the brake not retracting. In this case, adjustment is necessary, preferably done at a repair shop.
I was quite anxious when I found the brake piston stuck and not retracting. That time while driving, I noticed reduced braking power along with strange noises, and fuel consumption also skyrocketed. After researching, I learned it might be due to rust or debris clogging the brake caliper. Accumulated dust and moisture can cause corrosion, while insufficient or low-quality brake fluid can worsen the issue. I tried fixing it myself—first loosened the wheel to clean the piston surface and sprayed a dedicated lubricant to help it retract, but it didn’t help much. Eventually, I took it to a repair shop for a professional inspection. The technician used tools to release pressure, then thoroughly cleaned or replaced the components. Now, I’ve made it a habit to inspect and clean the brake system every quarter to avoid similar issues. If the piston remains stuck, overheating brake discs could lead to more severe failures—never delay repairs.
