Brake rotors are an integral part of a disc brake system.
Brake rotors are hardened steel discs with smooth surfaces on each side. Each surface is typically separated by a metal web that allows for heat dissipation and reduced weight. Brake rotors mount to the axle hubs of the vehicle and provide the braking surface for the disc brake system.
A portion of the brake rotor rides between the brake pads attached to the brake caliper. When the vehicle operator applies force to the brake pedal a rod pushes the plunger in the master cylinder. This forces brake fluid through the metal brake lines and flex hoses to the brake calipers mounted on the steering struts or the rear axle housings on vehicles equipped with rear disc brakes. The brake calipers squeeze both sides of the brake rotors between the brake pads attached to the brake calipers. The double sided rotors provide a great deal more braking surface than conventional drum type brakes. The additional surface and extreme pressure produced by the brake calipers make disc brakes a very efficient braking system.
Brake rotors are subject to wear and damage. If the brake pads are allowed to wear down to the backing plate the rotors can be damaged or destroyed. Worn brake rotors will cause the brake pads to wear much faster and reduce their braking power. Replace the brake pads when needed. If the brake rotors are not shinny and smooth on both sides, replace them for your safety.