Grooves in rotor? (no ABS)

JEDI

Lifer
Sep 25, 2001
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i noticed groves in my front rotors. (rear brakes are also disc, but no groves.)

should I be concerned?

edit: talked to my dealership's service mgr. he said he hears it all the time. it's caused by the semi-metalic brake pads. it's normal and nothing to worry about.

any concerns?
 

Demon-Xanth

Lifer
Feb 15, 2000
20,551
2
81
There's one groove that may be there for depth gauging. But if there were the only groove, I doubt you'd be asking. Take it to the dealer, tell them to fix it.
 

Can you pick oranges off them? If so, those are the good kind of groves.
 

jagec

Lifer
Apr 30, 2004
24,442
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it's not really DANGEROUS, but it does mean you'll want to change your rotors (or at least get them turned, depending on how deep the grooves are) next time you change your pads.
 

JEDI

Lifer
Sep 25, 2001
29,391
2,738
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Originally posted by: Demon-Xanth
There's one groove that may be there for depth gauging. But if there were the only groove, I doubt you'd be asking. Take it to the dealer, tell them to fix it.

yes, there's only 1 grove.

what do you mean depth gauging?
 

jagec

Lifer
Apr 30, 2004
24,442
6
81
Originally posted by: JEDI
Originally posted by: Demon-Xanth
There's one groove that may be there for depth gauging. But if there were the only groove, I doubt you'd be asking. Take it to the dealer, tell them to fix it.

yes, there's only 1 grove.

what do you mean depth gauging?

dude....GROOVE has two o's.

Depth gauging=tells you how thick the rotor's surface is. I've never heard of them putting a groove on rotors for this reason, though...you should be able to just look at the edge, yes?
 

spacejamz

Lifer
Mar 31, 2003
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given the # of GM threads lately, have to ask if the new car was GM or not...

just curious....
 

Demon-Xanth

Lifer
Feb 15, 2000
20,551
2
81
Sometimes a rotor will have a groove to let the machinists know how deep they can resurface a rotor. When the groove disappears, they're too far.
 

sao123

Lifer
May 27, 2002
12,653
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if front has grooves, but rear dont???
brake malfunction... return to dealer immediately.
 

JEDI

Lifer
Sep 25, 2001
29,391
2,738
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talked to my dealership's service mgr. he said he hears it all the time. it's caused by the semi-metalic brake pads. it's normal and nothing to worry about.

any concerns?
 

Shawn

Lifer
Apr 20, 2003
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Just leave it until your pads wear out, then change them both at the same time.