The Brake Caliper in cars particularly the BMW 330i is a part of the disc brake that operates as a clamp that squeezes the brake pads onto the rotors to stop rotation of the wheels. When the brake pedal is engaged the fluid pressure from the master cylinder pushes the caliper's pistons which are likely to be made from plastic aluminum or chrome plated steel. BMW 330i models utilize two primary types of brake calipers: The classification could also be based on the stationarity of the structures, that is, fixed and floating. They are secured and consist of a number of pistons applying force from either side of the rotor giving excellent results but are relatively expensive. On the other hand, there are floating calipers, also called the sliding calipers, and these consist of a single piston that is used for pushing the inner pad which in return compresses the caliper and apply pressure on both side of the rotor. While it is much more straightforward, it carries with it problems such as sticking caused by dirt or corrosion which will also influence braking and pad wear.
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