The hydraulic device that presses against the drum brake shoes and against the brake drum on the Nissan Sentra Wheel Cylinder slows and stops the vehicle. The Wheel Cylinder body, which is typically made of cast iron or aluminum, features a bore with an expander spring, similar to a cup seal, two pistons, and dust boots that are mounted on the backing plate. When the brake fluid enters the bore, the pistons receive the pressure as the pedal is applied. Therefore, the pistons push the shoes against the drum. The seals prevent any brake fluid leaks. Upon release of the pressure, the shoes are pulled inwards by the return springs, while the expander spring keeps the seals in place. Air is removed through a bleeder screw positioned at the high point. The moisture contained in glycol brake fluid can corrode the bore, which can cause pitting, seal wear, leaks, or seized pistons. Inspecting the Nissan Sentra Wheel Cylinder and rebuilding or replacing it when required preserves braking on any Nissan Sentra that features such a Wheel Cylinder. Regular fluid changes prolong the Nissan Sentra Wheel Cylinder lifetime.
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