A brake rotor is a smooth metal disc attached to the wheel hub. Most new cars (1999 and above) come with rotors at each wheel. Older cars may have drums instead of rotors at the rear wheels. Brake rotors play an essential part in the braking system. It is the friction between brake pads and rotors that cause your car to slow down and stop. As the rotors wear out (become thin or warped), they are unable to disperse the heat caused by the braking system. This will cause the brake fluid to boil and reduce the effectiveness of brake system significantly.
Facts to Note:
Brake rotors are changed in pairs. If you choose front brake rotors, both front wheels will get new rotors. This service comes with brake pads. Unless brake pads were changed recently, pads must be replaced while replacing the rotors.
How to Fix:
Measure the thickness of brake rotors.
Take out and change rotors and pads.
Perform a brake safety inspection.
Perform test drive.
It is a good idea to get the thickness of brake rotors measured annually. Your mechanic should measure the rotor thickness every time the brake pads are changed. Brake rotors usually last twice as long as brake pads, which usually mean you, need to change rotors every other brake service. If you drive the car with worn-out brake pads for too long, you will spoil the rotors.
Common symptoms indicating you may need to change the Brake Rotor/Disc:
Vibration or pulsation when applying brakes.
Blue discoloration of rotor surface.
Grooves or hot spots in rotors.
Importance of this service:
All services associated with proper function of your brakes are essential. In addition to safety issues, ignoring small repairs can quickly lead to more serious problems.