🔧 What is a Brake Caliper?
A brake caliper is the component that houses the brake pads and pistons. It’s mounted over the brake rotor (disc) and is responsible for squeezing the pads against the rotor whenever you press the brake pedal — creating friction that slows or stops the wheel.
⚙️ How Brake Calipers Work
- Driver presses the brake pedal.
- The master cylinder pushes brake fluid through the lines.
- Hydraulic pressure forces the pistons inside the caliper to move.
- Pistons push the brake pads against the rotor (disc).
- Friction slows the wheel rotation.
🛠️ Types of Brake Calipers
- Floating (Sliding) Caliper
- Most common type in everyday vehicles.
- Has pistons only on one side of the rotor.
- Slides back and forth to apply pressure on both pads.
- Cheaper, lighter, easier to service.
- Fixed Caliper
- Bolted solidly in place (doesn’t slide).
- Has pistons on both sides of the rotor.
- Single-Piston Caliper
- Uses one piston to press pads against the rotor.
- Common in economy cars and light vehicles.
- Multi-Piston Caliper (2, 4, 6, even 8 pistons)
- More pistons = more clamping force & even pressure.
Key Parts of a Caliper
- Caliper Body (Housing) – The main frame holding everything.
- Pistons – Cylinders that push pads against the rotor.
- Brake Pads – Friction material inside the caliper.
- Dust Boots & Seals – Keep dirt out, hold brake fluid.
- Guide Pins (in floating calipers) – Allow sliding movement.