I had the car up on jack stands while I was breaking in my new rear end. I also have new front/rear disc brakes that were just installed. There is loud noise coming from the rear when I press the brake pedal lightly. It comes on when the pads start to make contact with the rotor and goes away as more pressure is applied and the wheel stops. It's a loud noise and for sure caused by the pads rubbing on the rotor. I can keep in the noise going by keeping the brake pedal pressed in just enough to where the wheels are still spinning and the pads are rubbing on the rotors. This is a Wilwood setup. Only far fetched thing I can think of at this time is.... The rotors are painted black and the paint is suppose to polish off eventually. Could the presence of the paint on the rotors and the pads rubbing or almost grabbing it off cause this?..??? Could it be some sort of vibration noise?

Yes it could, i would double check the caliper brakets to make sure they are bolted down tight!!

could also be metallic pads,they can be noisy

I would guess it is probably the coating on the rotor causing the noise. Coated rotors sound like metal to metal grinding until the coating is worn off.

Yes it could, i would double check the caliper brakets to make sure they are bolted down tight!!

Glad to hear we're all thinking the same thing regarding the paint. I am 99% sure the calipers are tight as I safety wired them and made sure I had them torqued before the wire went on. Once the safety wire goes on there is not re-torquing without cutting off the wire. I also had to apply lock-tite which goes hand-in-hand with torquing. But of course there is that 1%.... I will let the paint polish off and see if the noise goes away.

could also be metallic pads,they can be noisy X2 Call wilwood and ask if you should be using a softer compound.... Also i had the same issue and i found that using a set of springs between the pin and pads help the clicking noise, it kept the pads from grabbing so quickly under the slightest touch of the pedal.

Its coming from the pad making contact with the rotor but its clicking on the pins between the pads. Look to see if the pins needs grease or if the are to small in diameter where the go threw the pads.

Definitely make sure everything is tight. I usually mark each bolt with a permanent marker once torqued to spec and then with a second mark after a certain mileage when it is rechecked. That way it is hard to miss a bolt.

Since they are new rotors, you could take a rotory grinder (80 grit) and just very *lightly* scuff the rotors try to do a swirl kind of pattern. It will take off any high spots and should help with rotor/pad breakin. Also will take off much of any coating as well. Make sure to break clean everything both pads and rotors.

Drive it and brake them in and you will be good to go.

Make sure you didn't do this - I did! Might not even be possible with the Wilwoods, but a coupla PBRs and it was easy with the PBRs. Made a heck of a racket too.

http://img.photobucket.com/albums/v61/gort69/DSCN0198.jpg

brake cleaner should remove any grease and paint!!

don't feel bad... one of my more experieced techs did the same thing ...we won't say what he tried to tell it was...lol

Make sure you didn't do this - I did! Might not even be possible with the Wilwoods, but a coupla PBRs and it was easy with the PBRs. Made a heck of a racket too.


Oooops! Are you sure it wasn't the PBRs that caused this in first place? :beers: You did have me look, but mine are facing the right way...

Oooops! Are you sure it wasn't the PBRs that caused this in first place? :beers: You did have me look, but mine are facing the right way...2 fune..made u look!!:beers:

You could check for clearance as well. Not sure but my rear brakes had to be shimmed for proper clearance on each side.