How to Check Rotors

The condition of the brake rotors on your car is just as important as the condition of the brake pads. If the rotors are not in good condition, they are likely to fail, and you will have a difficult time stopping the car. It is a good idea to inspect the brake rotors at least as often as you change the brakes; but if you are able to inspect them more often, then do so. The brake rotors are subject to a great deal of stress due to their design as they use friction to stop the car. They are, therefore, subject to excessive heat at times. Because of that heat, they are at risk of warping. Additionally, they are subject to damage if you allow the brake pads to wear beyond their recommended levels. The procedure for inspecting brake rotors is similar for all automobiles that use disc brakes.

Instructions

1

Place wheel chocks behind the rear tires of your automobile. Raise the vehicle with an automobile jack. Place a jack stand under the car near the jacking point and raise it up to the frame of the vehicle for added safety.

2

Remove the lug nuts on the wheel with a lug wrench then remove the wheel.

3

Inspect the surface of the brake rotor. It should be smooth with no damage or nicks. Make sure the rotor is not warped.

4

Measure the thickness of the rotor by closing the jaws of a micrometer over the rotor. Note the measurement and check it against the figure stamped on the rotor. The number on the rotor is the minimum thickness required for safety. If the rotor is thinner than the minimum requirement, you must replace it.

5

Perform the same inspection on the backside of the rotor, checking for surface damage. Remount the wheel on the car, tighten the lug nuts with the lug wrench then remove the jack stand. Lower the vehicle to the ground with the jack. Repeat the process on the other wheel.