The brake rotor has a very tough job. It must absorb the heat and friction while under braking and not warp. Inexpensive brake rotors made up of cheap metals can warp under spirited driving. This can cause a brake pedal pulsation under braking. A good quality set of rotors will hold their shape. The harder, longer lasting brake pads semi-metallic or full-metallic will wear out your rotors faster. Also, when changing pads the grooves developed in the rotor will cause the new pads to vibrate under light braking and squeal. You can avoid this by cutting the rotors or replacing them giving both pads and rotors flat surfaces to bed in with. If there is a large lip preventing you from getting the calipers off then your rotors may be worn beyond their service limit.

If you have a micrometer you can measure the brake rotor thickness. If it is too thin then you should replace the rotors. The minimum thicknesses are as follows: Front brake rotor minimum thickness: All models except M5 20.4 mm (0.73 in), Rear brake rotor minimum thickness: All models except M5 8.4 mm (0.73 in).

Always replace both rotors on the axle at the same time. This should provide even braking from both wheels preventing the car from pulling to one side or another under braking.

Lift and support the axle of the vehicle you are replacing the brake pads on. See our tech article on jacking up your vehicle.

Remove wheels on axle you are replacing brake rotors on.

In order to change the rotors you are going to have to remove the brake caliper. Follow the procedure in the tech article for either the front or rear brake pad removal to remove the calipers and then continue with this procedure.

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