Brake wheel cylinders push the brake shoes against the brake drum, causing friction that slows down the car. They are situated in the rear brake system, inside the brake drums. Over time, wheel cylinder seals may wear out and start leaking brake fluid, reducing the effectiveness of the brakes.
Facts to Note:
Brake wheel cylinders are changed in pairs. Both rear tires will get new cylinders.
How to Fix:
Examine rear wheel cylinders for leakage.
Examine rear brake shoes and hardware.
Change wheel cylinders if found faulty.
Adjust rear brakes.
Lube backing plate.
Ensure axle seals are not leaking into brake drums.
Bleed entire brake system.
Perform a brake inspection, including test drive.
It is a good idea to get the brake wheel cylinders checked once every year. You should get your brake system checked immediately if the brake warning light is on.
Common symptoms indicating you may need to change the Brake Wheel Cylinder:
Brake pedal goes all the way to the floor.
Noise from rear brakes.
Fluid leaking underneath the car near rear tires.
Importance of this service:
When you depress your brake pedal, the brake wheel cylinder applies pressure to the brake shoe. This pressure pushes the brake shoe into contact with the brake drum, which produces the friction that lets your vehicle to slow down and stop. When the brake wheel cylinder stops functioning, it is no longer able to exert enough force onto the brake shoe, and your vehicle will not be able to brake as effectively as it should.