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2007 GT3 PCCB brakes sounds like grinding marbles front end


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if bearings wouldn't the noise stick around? there presently is no vibration on front end.

Never tracked the car. Never hit a curb.

I did get new rears tires, same style brand as car came with, but didn't need front tires.

I brought it to dealers for sure they would hear it, but when service tech

and I went for ride I didn't hear it either!

It has been there and not for several hundred miles.

I do have 2 yrs left on warranty. Thanks.


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I have this same issue in my 997 GT3 with standard brakes. I don't think the sound is the pads on the rotors. I think it may be a resonance in the lines/brake controller. It particularly happens at very low speed (less than 5 mph) pulling into my driveway.

I told my dealer about it too, but since it is a sporadic issue, they couldn't do anything about it.

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I've not personally inspected a 997 GT3 front brake system, but, This experience from a 996 GT3 and 996 GT3 Cup brakes might apply. There are sheet metal heat shields on the back side of the front rotors that reduce heat soak from the rotor to the ball joint on the front lower control arm, and also to the steering arm ball joint. Two things can happen. Most likely is that one of these heat shields can bend toward the rotor and scrape/drag on it as it turns (just experienced this on the Cup Car I crew for this past weekend at Miller); secondly, gravel can jamb on either side of the shields and cause a similar drag on the rotor. The fix involves bending the sheet metal back away from the rotors. This is most easily done with the front rotor removed. Have a look and let us know what you find.

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  • 4 weeks later...
  • 8 months later...

Sorry for taking so long to get back.

Brought the car back to dealer after experiencing the problem.

Had high miles on sport cup fronts as I have not tracked car yet.

I put new front tires at dealers suggestion.

Service manager thought maybe belts in tires?

Doubted it myself, but , service manager and I went for

ride and of course, we did not hear the grinding noise,

of course I did all the way to dealer!

Now new tires, and guess what, grinding noise had ZERO change.

I think that Craig might be right., it could be gravel.

Is this warranty? I don't really want to take my PCCB rotors off myself.

Sorry about the underline, didnt realize till I was done.

Edited by stuski65
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