Lexus RX330 Brake Master Cylinder is the core of the hydraulic braking system of the SUV, which converts the pressure of a pedal into the fluid pressure that grips the pads on rotors. The Brake Master Cylinder, which is mounted at the front of the vacuum booster, is designed with dual pistons, springs, and seals in a cast iron or aluminum bore and it receives a plastic reservoir covered with O-rings to keep the air out. When the brake pedal is pressed, it sends a rod that forces the dual pistons forward in the Brake Master Cylinder, which accumulates pressure in two distinct circuits such that one leak will not leave the RX330 without braking. Upon release of the pedal, the pistons are pulled back by return springs, ports open, and the Brake Master Cylinder forces fresh fluid through the reservoir and prepares the system to make the next stop. Throughout the model years, Lexus kept this dual-circuit Brake Master Cylinder design, the only difference being an integral reservoir compared to an external reservoir, but both are capable of providing the same reliable hydraulic action to all Lexus RX330 and strengthen the braking confidence in all the RX330 trims, which is the same as the Lexus standard.
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