The Lexus ES300 Wheel Cylinder is responsible for converting hydraulic fluid pressure into outward movement of the piston which presses brake shoes against the drum for confident stopping. Every Lexus ES300 drum brake has a cast aluminum or earlier cast iron Wheel Cylinder that mounts on the backing plate keeping twin pistons, cup seals, an expander spring, and dust boots. Brake fluid enters the bore, pushes against the pistons, brakes the car, then return springs and an internal expander spring pull everything back in. A top-mounted bleeder screw on the Wheel Cylinder allows trapped air to escape. On the later models of the Lexus ES300 cars, aluminum construction is applied to resist rust, but the basic twin-piston Wheel Cylinder design was the same in all years. Moisture can pit the bore resulting in leaks and low pedal feel or sticking, so Lexus drivers should inspect the ES300 Wheel Cylinder when it is time for shoe service and replace or rebuild when honing cannot restore proper clearance.
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