Rotor Replacement Question
Thread Starter
Racer
Joined: Aug 2006
Posts: 303
Likes: 14
From: Minneapolis
Rotor Replacement Question
How can you tell if they really need replacing? I need new pads all the way around, and one mechanics says the rotors are at the end of their life, and another who says that they are fine. There is no pulsating when braking, and no cracks anywhere on them either. The outside edge has a little "lip" on it maybe 1/16". Thanks.
Race Car
Joined: Sep 2004
Posts: 4,883
Likes: 3
From: Wilmington NC
Factory specs call for no more than a 7mm crack between vent holes. If they are 7 or better or if they cascade over the edge of the rotor then they need replacing. Its not recommended that you "turn" them, although a very light pass that doesn't take off anything but the tallest high spots wouldn't be bad. Just don't have them ground down like a normal "turning"
Rennlist Member
Joined: Aug 2004
Posts: 941
Likes: 1
From: Los Altos, CA
The rotors also have a minimum thickness. It is typically marked on the rotor hat somewhere. You should measure the rotor and compare that with the minimum. You can use a micrometer to measure it.
If you have 1/16" lip you do have some wear...
If you have 1/16" lip you do have some wear...
Rennlist Member
Joined: Jun 2005
Posts: 2,872
Likes: 222
From: Schattenbaum/MNY Regions
No cracks and a 1/16"--unless you feel something wrong when braking, you're absolutely fine. Check 'em when you next change the pads or bleed the brakes.
Turning not recommended, and at the price that you can buy new ones from Sunset, why bother anyway.
Turning not recommended, and at the price that you can buy new ones from Sunset, why bother anyway.
Three Wheelin'
Joined: Jun 2002
Posts: 1,388
Likes: 2
From: NE Oregon
I just went through this. I was told that if there is a discernable lip around the edge, they are ready to be replaced. Mine did, plus when I took it in the shop told me they discs were not OEM. So I had all 4 replaced, with new OEM pads at the same time. Much better!
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Rennlist Member
Joined: May 2001
Posts: 3,052
Likes: 8
I just did too -- measured my fronts for thickness, and they're right at 30mm, the wear limit. So if anyone has a pair of front rotors for sale that are new/barely used, let me know. Otherwise I'll have to commit the sin of paying retail...
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