A brake caliper is a critical component of a vehicle’s disc braking system, acting as the housing for brake pads and pistons to slow or stop the car. Located inside the wheel, it clamps around the rotor (disc) and uses hydraulic pressure to create the friction necessary to decelerate the vehicle. How a Brake Caliper Works
Pressing the Brake: When you press the brake pedal, brake fluid is pushed from the master cylinder to the caliper through hoses.
Actuating Pistons: The fluid pressure forces one or more pistons inside the caliper to move.
Clamping Action: These pistons push the brake pads against the spinning rotor, creating friction that slows the wheel. Key Parts of a Brake Caliper
Caliper Body/Housing: The main structure holding components.
Piston(s): Uses hydraulic pressure to force pads against the rotor. Brake Pads: Friction material that touches the rotor.
Caliper Bracket: Attaches the assembly to the vehicle’s suspension.
Guide Pins/Slider Pins: Allow the caliper to move, ensuring even pressure.
Dust Boot/Seal: Protects the piston from debris and prevents fluid leaks. Types of Brake Calipers
Floating/Sliding Calipers: These move on guide pins. The piston pushes the inner pad, and the caliper slides to pull the outer pad against the rotor.
Fixed Calipers: These do not move, but instead use pistons on both sides of the rotor, commonly found in high-performance cars. Signs of a Failing Brake Caliper
Vehicle Pulling: The car jerks or pulls to one side during braking. Unusual Noises: Constant squeaking, squealing, or grinding. Soft Pedal: The brake pedal feels spongy or soft. Fluid Leaks: Brake fluid leaks near the wheels. Reduced Braking: Increased stopping distance.
If you are experiencing these symptoms, I can help you understand: How to check for a stuck caliper slide pin The cost of a brake caliper replacement If you should replace them in pairs Let me know which you’d like to know more about! Brake Caliper Explained