What to Do About Brake Dragging?

[MarcusDella]

Brake system "dragging" refers to various abnormal phenomena caused by the transmission of braking force to the wheel's brake disc without manual pressure applied to the brake pedal, resulting in the wheel's inability to rotate freely. Below are the reasons for dragging and their solutions: 1. Poor return of the brake master cylinder. This condition usually causes multiple wheels to "drag" simultaneously. If the master cylinder is diagnosed as faulty, it needs to be replaced with a new one (repairing and reusing the master cylinder is not recommended). 2. Blocked brake lines. This typically occurs on a single wheel, requiring line replacement and investigation into the cause of the blockage. 3. Faulty brake caliper (brake wheel cylinder). Poor return of the brake caliper may be due to rust on the piston caused by moisture in the brake fluid, preventing smooth return. Cleaning the piston is necessary, and in severe cases, the entire caliper assembly may need replacement. 4. Sticking of the caliper guide pins. Aging or damaged dust boots on the guide pins allow dust and moisture to enter, leading to rust and preventing timely return of the brake caliper. Cleaning the rust, lubricating the guide pins, and replacing damaged dust boots are required.