Brake caliper
Squeezes the brake pads against the disc.
Mounted around a section of each brake disc.
Fluid pressure moves pistons; sliding or fixed designs apply force to both disc faces differently.
A hydraulic hand gripping a spinning plate.
Pulling, dragging, leaks or uneven wear can involve the caliper, hose or pad movement.
Pads and discs are measured wear items. Driving, environment and regenerative braking change wear; use the actual inspection limits.
Ordinary friction service differs greatly from carbon-ceramic replacement or hydraulic-controller work; obtain a vehicle-specific quote.
A colorful BMW caliper is not sufficient to identify the full brake specification.
BMW models with hydraulic friction brakes; performance equipment and parking-brake design vary.