This pressurized brake fluid in the wheel cylinder then pushes the cylinder pistons outwards, pressing each brake shoe against the rotating brake drum to stop the wheel. The master cylinder then converts this force into hydraulic pressure, carried by brake fluid through a brake line to each wheel cylinder. When you depress the brake pedal, the force generated by your foot transfers to the brake master cylinder. Now that we understand the structure of a brake wheel cylinder, let’s get to how the wheel cylinder functions with the rest of the braking system. The bleeder screw is hollow, with a small hole in the head that assists with brake bleed. A bleeder screw that’s used to bleed brake fluid and eliminate air from the brake cylinder.An inlet port that connects the wheel cylinder to a brake line that carries brake fluid.In addition to those, there are two other vital components: The dust cap protects the cylinder bore from moisture, brake dust, and dirt. An outer dust boot (also called a dust cap) covers each end of the wheel cylinder.A spring between the pistons that hold each piston seal in position.Each piston has an internal piston seal (or rubber cup) to maintain brake pressure and prevent brake fluid from leaking past the piston.A piston on each end that connects to a brake shoe via a shaft.The iron or aluminium protects it from corrosion and rust.Ī new wheel cylinder bore is fitted with these: Its main body is a cylinder with a bore, typically made of cast iron or aluminium. The wheel cylinder structure is relatively simple. The Anatomy of a Drum Brake Wheel Cylinder It’ll make it easier for you to understand how things can go wrong later. Now that we’ve covered the basics, let’s dive deep into how wheel cylinders are structured. While most modern vehicles use disc brakes, it’s still common for older vehicles or small trucks to have drum brakes on their rear tires. Unlike the drum brake wheel cylinder that delivers a pushing force onto a brake shoe, a disc brake caliper squeezes brake pads onto a spinning rotor to slow the car down. It’s used to push a pair of brake shoes outwards so that they can contact a brake drum to slow down your vehicle with friction. Like any moving component, the slave cylinder is subject wear and may become damaged, which leads to a brake fluid leak and hindered brake performance. The backing plate protects the brake wheel cylinder components from water, dirt, and debris.Īlso called a slave cylinder, it applies force on the brake shoes to help halt a car. The wheel cylinder is positioned at the top of the wheel inside the drum brake - fixed to the drum brake backing plate with mounting bolts. The brake wheel cylinder is a crucial component of your car’s drum brake system.
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