The Brake Caliper alters the pressure you apply on the pedal into a clamping pressure that presses the pads on the rotor and stops the roadster. Within the cast iron body, hydraulic fluid acts upon the steel or phenolic pistons, which are pushed outward, while seals and dust boots prevent debris and leakage. Fixed units bolt rigidly in place with opposing pistons for balanced bite, and floating Brake Caliper assemblies slide on guide pins, using one inboard piston to pull the outer pad against the disc. These are the two principal Brake Caliper designs that have emerged across BMW Z3 production. Although the fixed version offers a firmer feel and more even wear, the floating units weigh less and fit the compact Z3 rear suspension on BMW models where some integrate a screw style parking brake. The BMW Z3 Brake Caliper, irrespective of type, comes with a bleeder screw to remove trapped air and a hose port to direct pressurized fluid from the master cylinder. Piston seizure, leaks, uneven pad wear, dragging, and other faults are common. A sticking Brake Caliper can overheat the disc and should never be ignored. Having them fixed promptly ensures sharp stopping power.
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