Getting brake squeal after replacing pads/rotors

[Docwyte]

Just replaced the front pads/rotors on my '11 Audi S4. They were silent before I did this.

Replaced with slotted front rotors and street pads from Textar. Put everything back together and the car sounded like a garbage truck on light stops. Bedded the pads in twice, no difference.

Took everything apart a few days later (all was put together properly) and put anti squeal on the backs of the outboard pads. Can't put it on the inboard pads as they have spring clips that engage the caliper piston.

The squeal is mostly gone now, but it intermittently returns. The stuff I used was a spray, should I go buy some anti squeal paste? I also beveled the leading the trailing edges with a file...

Suggestions?

[SwankPeRFection]

I always use paste, but it very well could be the pad compound. There are some pads/rotor combos that will just squeak BECAUSE racing brakes. i.e. STI brakes. lol That was Subaru's excuse. Usually when they squeal on light braking or when cold and then it goes away as they get hot, it's a compound issue.... that's that it's an "issue" per say in my eyes.

[drob23]

I've used the red paste before with good success. Although most of my brake noise was due to the pad material (in my case a track pad). Switching pads cured it for me.

I don't think the slotted rotors can be considered the source of the squealing. I'd guess it's always due to the pad material or the backing plates/shims, adding some brake quiet paste to the backing plates can help. Good luck sorting it out, noisy brakes rank high up in the sucks to drive category.

[BoostEasy]

Overall when I do brakes I've had good luck with the paste, putting it on back plate of the pads where they touch anything metal and on the tabs/ears on the same and that's usually enough.

Given you had some success with the spray, I'd buy the paste and try a little more. Make sure you get the edges of the back plate where it may touch the caliper including the ears.

Why couldn't you add paste to the inboard pad backing plate?

[Docwyte]

These Textar pads are a street pad, traditionally they're very quiet.

The inboard pads have spring clips that snap into the caliper piston, that's why I didn't spray them with the anti squeal. I'll go get some of the paste and hit them up when I have my wheels off this weekend to put my BBS' on and go from there...

Getting pretty good at this front brake job, this will be the 3rd time I've had everything apart...

[Dr GP]

I think that if you bed the brakes properly, you should be fine, Are the new pads ceramic?

[Docwyte]

Pads were bedded twice. That's not the issue. Nope, new pads are basically the same compound as OEM.

What I did notice when I removed the OEM pads is they had a sticky surface on the outboard pad that strongly bonded them to the caliper. I had to work pretty hard with a large screwdriver to remove them. The new pads had no sticky surface to bond to the caliper and squealed loudly when I first put them in. When I sprayed some anti squeal stickum on them they quieted down some, but not all the way.

Hence my theory that if I use the gel stuff I'll get a better bond and they'll finally shut up.

[mmm def]

Mine squeaked for a bit, went away after about 500 miles

[MYFASTA4]

Red brake grease or fcp sells a clear grease , I would start there. Don't go crazy with it just where caliper touches the pad.