How to Solve the Problem of Motorcycle Disc Brake Not Returning to Position?
2 Answers
Replace the brake caliper. The disc brake sticking and not retracting is caused by water entering the brake fluid, leading to rust on the caliper piston. Check whether the lower brake caliper is damaged, whether the brake caliper plunger is rusted or damaged and stuck, and whether there is an issue with the upper brake caliper causing it not to return to position.
I've been riding motorcycles for nearly twenty years and have encountered the issue of disc brakes not releasing a few times. Most often, it's due to the caliper pistons getting stuck by mud or rust, especially after riding in the rain without timely cleaning. First, try handling it yourself: remove the wheel, spray brake cleaner on the pistons and guide pins, apply some special grease to ensure smooth sliding. Then check if the brake fluid is dirty or has air bubbles—if the fluid level is low or cloudy, you'll need to replace it and bleed the air. Warped discs can also cause dragging brakes; simply measure if they're even and have a technician correct them if necessary. The key is not to ignore it—delaying action can lead to overheating and damage, and more dangerously, sluggish response during high-speed emergency braking. Make it a habit to clean the brake components during regular maintenance and add some lubrication annually to prevent issues before they arise.
