The Toyota Avalon Wheel Cylinder changes hydraulic pressure into a movement of the pistons that presses on the drum brake shoes for strong stopping power. Fixed to the backing plate, the Wheel Cylinder body contains a cast iron or aluminum bore with twin pistons, rubber cup seals, an expander spring, and dust boots to keep ingress dirt off the parts. As brake fluid fills the central chamber from the line, it raises pressure and forces the pistons outward, causing the shoes to contact the drum and slowing the car, while the seal lips of this Wheel Cylinder are forced tightly against the bore to prevent leaks. When the pedal is let off, return springs pull the shoes back, while the expander spring holds the cup seals tight to prevent leaks and ready the system for the next stop. The earlier Toyota Avalon models were built with a heavier cast iron body, while the later editions of Avalon were fitted with a lighter aluminum Wheel Cylinder. Although the later editions of Avalon are less prone to rust, the design and operation are still the same. A bleeder screw located in the top passage can help to brake air out. The boots should not seep fluid. If they do, it is probably worth a rebuild or a new Wheel Cylinder as you will feel a low pedal or grabbing in the Toyota brake system.
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