The Lexus RX350 Brake Caliper is a device applied to convert hydraulic pressure to the clamping force that presses the pads on the rotor, bringing the vehicle to a controlled stop. Within its cast iron shell, steel or phenolic pistons ride inside sealed bores and are fed incompressible fluid from the master cylinder applied in Lexus vehicles. Two main designs are displayed on the RX350: floating Brake Caliper and fixed Brake Caliper. Floating versions, typical of many Lexus trims, have one or more pistons on the inboard side and slide on guide pins, saving weight but also prone to pin corrosion and consequent drag or uneven wear of the pistons. Fixed units, available as part of certain sport-oriented RX350 packages, are bolted rigidly in place and utilize multiple opposing pistons for equal pad pressure and stronger feel. Some rear assemblies incorporate a screw-type parking brake feature that has to be wound back with a tool when replacing pads. Symptoms of a failing Brake Caliper include leaks, soft pedal, pulling, grinding sounds, and irregular pad thickness. Routine checks are carried out to keep the Lexus brake system responsive so every RX350 driver can depend on the proper function of a Brake Caliper during daily excursions.
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