Ok i finally got the time to pull the wheels off and examine the brakes closely and made an interesting and puzzling discovery. The caliper mounting bracket is rubbing the rotor on one corner of the outside of the bracket but not the other. Its as if the whole caliper mounting bracket is not sitting flush on the rotor and is skewed to one side. I havent pulled off the other wheel but i assume the same problem is affecting the other side. How did this happen and how would i go about correcting it? A big part of me is considering putting washers between the mounting bracket and the axle housing where it bolts on to try to center it better but i would need more washers on one both than the other. If its not clear what is going on i will post pictures of the problem later tonight.

Also the e-brake freeplay needs to be adjusted. I read up on how to do it but the problem is the torx adjusting screw does not want to budge and i feel if i push farther ill just snap off my torx bit in the screw. Any tips?

 

I'm not quite sure I understand. Check the following pic (and notice the shims which help center the caliper over the rotor and the backing plate itself--IIRC, there is a left and a right):

https://www.thirdgen.org/forums/atta...s-89-shims.jpg

I see that the rear a 9-bolt. I've read where only the 10-bolt got the shims, so....

James

 

Hmmm thats interesting. Well i did a bit more digging. It is not actually rubbing on the rotor and is pretty close to centered after all (the wheel was off and the rotor had fallen forward making it look like the brake was not lined up correctly). So Im still unsure of the problem. Im thinking it might be just time for a caliper rebuild. Im getting uneven brake wear (only the outer half of the rotor is getting cleaned). I also had it up on jackstands so i started the car up and put it in drive on jackstands and stood on the brakes. I could not lock the rear wheels. So i upped the proportioning valve until they would stop the wheels quickly. It does seem to be better as far as rubbing goes but still not perfect. I dont suppose it could be just the pads need to wear in? Ive probably only driven 100 miles on the new pads and regreased slidpins.

 

Anyone? Does it just need to be broken in a bit? Or do i need a different set of pads? Or a caliper rebuild? How tight should the pads be to get in the bracket? These pads were hard to install in their bracket (the "ears" of the pad that fit in the bracket barely fit).

 

bump

 

bump no one knows this?

 

A rebuild never hurts and it's pretty easy to do. I remember when I went from the delco discs to the pbr discs, the carriers did hit the rotor. I used a couple washers and spaced the carrier back.

Will

 

In a recent magazine article, it was recommended that new brakes be 'bedded in' to the tune of 200 street miles.
Whether this will improve your setup is difficult to say.
Somewhere in these threads is an article that describes shimming the carrier for not only equal spacing left and right but diagonally as well so the pads contacted the rotor parallel.

 

Thanks for all the input guys. Everytime i drive it, it seems to be less and less noticable that its rubbing. Either im getting used to it or its getting better. Still have uneven wear on the rotors but that is even looking a bit better on the passenger side at least.

 

These things take time. Never expect brakes to work 100% after a 10 miles test drive. Nor should you expect to see perfectly worn, shiny rotors either. It takes time, an trying to "rush" that process will either toast your brakes or get you in an accident. Just drive the car, avoid aggressive braking for a couple hundred miles, and the components should start to wear into eachother.

Will

 

Thanks for the advice. Im driving it up to storrs today (an hour drive) so i will find out how it acts. Also..nice iroc. Looks like mine.

 

Put PBR calipers on this week had the same problem! First time I drove'bout 10 mi. heard it getting better, after I backed up and hit brakes hard a couple of times. Last night I drove 'bout 40 miles/ freeway/. city. The rubbing stopped, it was only rubbing on right side? Seems they just needed to seat up, am gonna try again today to make sure, will post if anymore problems...

 

Well i just drove about 60 miles today. They still rub a bit but very very slightly (as in i can only hear them rubbing if im really really listening for it). It was terrible when i first put them in and now they are getting better. I think im just going to drive on them for awhile more and see what happens. They stop great though!

 

This is a common problem, I had the same problem when I put them on my car. You need to shim the carrier to get it parallel with the rotor.

 

Carrier? Your not talking the gears are u? Or are you talking about the caliper mounting bracket? Cause in my second post i realized that they were parallel to the rotor. They are getting better and better the more i drive it.

 

The caliper bracket.