Professional Auto Care
The drum brake system includes a brake drum, hydraulic wheel cylinder, brake shoes and return springs. Pressing the brake pedal causes the piston to push the brake shoes against the brake drum, stopping the car. Drum brakes are generally used to stop the rear wheels on older and lower performance vehicles. The drum is connected to either the rear axle or a wheel hub, and the wheel is bolted onto the drum. When the brake pedal is pressed, the pistons in the wheel cylinder move outwards as a result of the brake fluid being pressurized. The brake shoes are forced against the inside surface of the brake drum in order to stop it from turning. This friction causes the lining on the brake shoe to gradually wear out at which time the brake shoes should be replaced.
It is important that when brake shoes are replaced, brake hardware, including the brake return springs should be checked for rust. Rusty return springs can break, allowing the brake shoes to remain in contact with the brake drum when the brakes are not applied, and causing the brake shoes to wear out prematurely.
A common failure of the drum brake system is a leaking wheel cylinder. When the seals around the wheel cylinder pistons start to deteriorate with age, brake fluid can leak past and start to contaminate the brake components. Once brake linings become soaked with brake fluid, they must be replaced.
Another failure of the drum brake system is an out of round brake drum. This occurs when the drum becomes more oval shaped than perfectly round and can cause the brake pedal to pulsate under braking.
A broken return spring will cause the brake shoes to remain in contact with the brake drum when the brakes are not applied.
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Function: A hydraulic component that forces the brake shoes against the brake drum to slow or stop the vehicle.
Signs of Wear: Reduced braking force, spongy brake pedal feel, increased stopping distances, fluid leakage near brake drum.
Professional Auto Care is an award-winning family owned and operated auto repair shop located in southwest Houston. It has been run by the same family, the Serratos Family, for nearly 35 years. Professional Auto Care services Domestic, Asian as well as select European vehicles. We are known for our professionalism, transparency and quality of work. Since our humble beginning in 1983, we always strove to provide the best, most reliable service in Houston with a hint of the personal touch. The founders, Everardo and Claudia Serratos, are still involved with the daily operations of the car maintenance and auto repair shop.