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If they are warped, they need to be turned, if they are groved, they need to be turned. If they are glazed, they need to be turned. In general, if you are working on the brakes, they need to be turned.
If they are too thin (not wide enough across) to be turned, they need to be replaced. Many newer rotors are not thick enough to be turned, so you just replace them every time you replace the brakes. Most auto parts retailers will measure the thickness of the rotors for you and tell you if they can be turned.

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16y ago
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17y ago

you can do a visual check if you can see the pads and rotors or a hearing test while driving the car start coming to a stop if you hear a highpitched squeel you need new pads If there is a grinding sound when you step on the brake , you need pads and possibly rotors (depending on the damage) . To check your brakes you need to remove the tire and inspect the pads and rotor . If there is little or no "meat" left on the pad they need changing . If there is pulsing in the peddle when you depress the brakes the rotors may be warped from heat and need to be cut or replaced . Drum brakes require you to remove the tire and drumm to check the shoes .

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13y ago

Rotors need to be changed when they have been resurfaced too many times or becomed too warped to be turned and leave them thick enough for safety. Brake pads should be replaced every 30-40,000 miles depending on driving habits. When you change the break pads, have the rotors resurfaced at the same time. It only costs about $10.00 each to have them turned at the auto parts shop. Few professionals, if any, will replace pads without turning the rotors.

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Q: When do you change brake pads and rotors?
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When rotors need to be changed usually the pads have worn down. It is always a good idea to change pads when changing rotors.


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