The Subaru Impreza Wheel Cylinder utilizes hydraulic pressure to push the brake shoes against the drum using a piston. The Wheel Cylinder body mounted to the backing plate is made of cast iron or aluminum. The bore in the Wheel Cylinder contains two pistons, cup seals, an expander spring, and dust boots. These dust boots protect inner surfaces from dirt and debris. The very middle of the bore is where the brake fluid enters. When the pedal is pressed, that pressure causes the pistons to push so the shoes touch the drum. Meanwhile, the lips of the seals get bigger against the bore so the fluid does not leak. When pressure is released, a return spring pulls back the shoes and pistons, and the expander spring keeps the seals seated. The pistons of the Wheel Cylinder may push directly on the shoes, or short links may be applied, as is common with Subaru Impreza drum brake assemblies. Every Subaru Impreza's brakes feature a bleeder screw at the point, which purges trapped air. The bore can be corroded and may leak or seize due to moisture. The Wheel Cylinder must be checked and rebuilt or replaced. A periodic check-up will keep the Wheel Cylinder on your Subaru Impreza in good shape.
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