Contour Enthusiasts Group Archives Forums Modifications Brakes Odd rotor issue Billet NDL

OK here we go.. 2000 CSVT with 12.2" Wilwood Billet NDL and SS lines all around. Both have been installed for about 9 months.

About 3 months ago my front right brake started to make noise after warming up. (About 8, 25-0 mph stops inside 5 minutes) It sounds like the vibration you would hear from a large truck like duty dump truck. It only makes noise when the brakes are off and then slowly fades over time.

When it originaly started to make noise I pulled the pads and everything looked OK (checked all the bolts were tight ex..). Wheel rotated fine but there is just a touch (very little) pad drag, but not much. So I applied a little "brake quiet" to the back of the pads and for the most part no more noise.

Today I noticed a bit of gouging on the outside the of rotor like a worn out pad would make but it's only 1/16 wide and a bit more than 1/32 deep, located on the rotor about an inch down from the top of the rotor.

Clicky

So I pulled the pad and it looks fine, plenty of pad left. I do not have a mircomiter but with a hand rule I checked the pads and they are evenly worn, except for some very, very sligh cupping runnig the lengh of the pad about 1/64 or less at the same location where the gouge is on the rotor.

What I do not understand is how can there be material missing from both the pad and the roter? I could guess that an object was lodged into the brake pad and then scored the roter but then why the odd cupping on the pad.

I think the two noise issues are most likely unrelated. However the gouge appears that you picked up some type of foreign material on the pad or rotor and it got lodged in place gouging both.

Rick

Thanks Rick.

That's what I was thinking also.

Is it normal for a pad to touch a little???

I am thinking this may be part 2 of a problem I had in the spring with my SS line (same side) that got cut when a chunk of sheet metal wedged it's self like a spring against the SS line, slowly cutting every time I hit a bump or turned the wheel sharply. Lucky for me my brakes only failed when I was 400 yards from work. Contrary to popular belief the redundant brake system does not help when you have a line cut, almost no amount of braking power.

It just pisses me off, only nine months since installing the upgraded brakes and I already need a new rotor, pads and SS lines. I guess I am lucky that the brakes are so robust that they can handle this amount a abuse and no major failure (me = dead).

Once again Rick thank you and the other CEG'ers who have posted info over the years.

This looks to be a piece of debris stuck in there which finally got free over time. Given the clamp load and such it's certaily possible for the rock to get stuck in the pad.

The rotor is not 'bad' from what I see in the pic. Scarred yes, but bad? How deep is the groove? .010, .015"? Not pretty but I wouldn't repalce it unless the scar passes over a hole in which case you should check this area first where it could be a stress riser for a crack.

Rotor: $92
Bolts: $3.50

This is really a fairly common thing. Yours is a little deeper than most, but certainly not bad enough to require replacing the pads or rotors. My car has a rotor with a similar groove in the rotor right now, but not as deep as yours. Unless you are obsessed the the looks of it, just clean things up and get a lot more wear out of those brakes.

It's less than .015, will check tomorrow for cracks.

Any idea why I get the whine when the pads warm up and the breaks are off? Because the pad is not flat?

Thanks

Harmonic vibes. Next time you have the wheel off, put some silione (a dab) under the sping clips on the top and bottom of the pads. And be sure they have some tension on them still.

What pads are in there now?

I do not have the part number with me (will check when i get home) but they were for Street / lt track use. The back of the pad was stamped "Raybestos".

On the back of the pad- 15-?-XXXX

The ? will be the compound of the pad. I'm guessing Q pads. Or it's on the pad box too.