How to Reset the Rotation of the Rear Brake Caliper Piston?
2 Answers
To reset the rear brake caliper piston, rotate the rear brake pads until they can accommodate the brake pads, ensuring that the brake pads and brake disc fit together properly, which indicates successful rotation reset. Below is relevant information about the brake caliper: 1. Function: The brake caliper is an essential chassis braking component in the braking system. Its main function is to push the brake pads, causing them to frictionally engage with the brake drum, thereby reducing speed or bringing the vehicle to a stop. 2. Working Principle: ① Passenger Cars: When the brake pedal is pressed, the oil outlet opens while the oil inlet closes. When the brake pedal is released, the oil outlet in the master cylinder closes, and the oil inlet opens. ② Trucks: The air pump, driven by the engine, compresses air into high-pressure gas stored in the air reservoir. One of the air reservoirs is connected to the brake master cylinder via pipelines.
Just helped my neighbor with this yesterday. Resetting the rear brake caliper piston is actually quite particular. First, you need to remove the wheel and the old brake pads, with the caliper still hanging on the brake disc. The key is to use a brake piston adjustment tool—it looks like a big wrench with grooves at the front that can latch onto the piston's slots. Slowly turn the tool clockwise by hand, feeling the piston retract as it rotates. Never force it. If the piston won't turn, it might be rusted and stuck, so spray some brake cleaner for lubrication. After resetting, the piston's end face should be flush with the caliper housing. Finally, when installing new brake pads, check if the retraction is smooth. Older cars are especially prone to sticking, so it's best to apply a dab of brake-specific lubricant to the piston edges during maintenance.
