Brake rotors are the discs your pads squeeze to slow the car. People often replace pads and forget the rotors, but worn rotors undo the benefit of new pads and can be unsafe.
Signs your rotors need attention
- A pulsing or vibration through the pedal when braking, a classic sign of warped rotors.
- Deep grooves or scoring you can feel with a fingernail across the rotor face.
- A blue tint from overheating, or visible cracks.
- A lip of raised metal at the outer edge, showing the rotor has worn thin in the middle.
Can you just change the pads?
If the rotors are smooth, within the minimum thickness stamped on them, and not warped, new pads alone are fine. If they are grooved, thin or warped, replace them, and always replace rotors in axle pairs.
Why it matters
Worn rotors reduce braking power and can cause vibration and noise. Since brakes are a safety system, it is worth doing right.
Frequently asked questions
Can warped rotors be fixed?
They can sometimes be machined smooth if thick enough, but many are now replaced because they are thin and cheap enough that replacement is simpler.
How long do rotors last?
Often through two or more sets of pads, but hard use, rust and heat shorten their life.
See our brake guides for pads and related parts.
