What to Do When the Caliper Piston Doesn't Retract?

1 Answers
Charles
07/25/25 9:33pm
Caliper piston not retracting may indicate an issue with the brake pads, and it is advisable to visit a 4S shop for repairs. Below is an introduction to brake calipers: 1. Introduction: The brake caliper is the component that applies force to the brake disc. The hydraulic pressure generated by the master cylinder ultimately acts on the piston inside the caliper. When the piston expands, it pushes the brake pads against the brake disc. 2. Piston Position: In ordinary family cars, the caliper piston is located only on one side of the caliper, typically the side behind the brake disc, so only the caliper and the brake pads fixed on it are visible from the outside. High-performance cars use opposed multi-piston calipers. 'Opposed' means that there are pistons on both sides of the brake disc, which apply pressure in opposite directions during braking, pushing the brake pads on both sides against the brake disc.
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