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The Anti-RUB
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1,723 Posts
Sounds good. There are some grooves in the rotors...turn em or replace em?
Depends on how deep the grooves are. Slight grooves are normal and are nothing to be worried about. Deep grooves are a problem. Your local brake shop should be able to tell you if they are too deep for turning or not. If they are too deep, only then should you consider replacing them. Good luck...
 

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The Anti-RUB
Joined
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1,723 Posts
Groves don't matter, warp, and thickness does.
Deep grooves do matter, especially when installing new brake pads. The grooves will be areas of the rotor that the brake pads won't make contact with, which can seriously hinder your braking power. It also makes the pads wear quicker due to all the force from the calipers being applied to a smaller surface area on the pads.

Its not a big deal with small grooves because the brake pads will conform to the grooves within a couple miles or so. But it is an issue with deep grooves.

If the grooves are too deep, turning them would result in the rotor being too thin and not able to dissipate heat properly and can even lead to the rotors warping or cracking. Your local brake shop can tell you if they are too deep or not.
 
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