Jay S.

Hi!
I just replaced all 4 sets of pads on my '90 S4. They had been squealing pretty bad. The pads were about 70% worn all around. I did everything per the instructions from the many 928 websites and put in that gummy anti-squeal stuff on the backs of the pads. But they still squeak and squeal. It's not as bad as before, but it's still noticeable and people in other cars can hear it too. It seems like light pressure on the brakes really brings on the squeal and more pressure will stop the squeal. This can't be normal? I've heard brakes squeal when new, but how long does it take to stop? I have about 50 miles on it now.
Thanks,
Jay in Az

PS: I only broke one of the sensors- the first one and after that I figured out how they fit and remove- not too bad I thought.

WallyP

It sounds as if you didn't use the anti-squeal brake pad dampeners that Porsche intended for your model.

They help a lot. I just put Metal Masters and the dampeners on my '90GT, and after about 1200 miles, still no squeal.

MikeN

I second Wally's response. What you have is normal to.....for brake squeak that is. Light pressure causes the vibration of the pad itself which is heard as a squeak. Heavy pressure causes the vibration to stop along with the noise. The dampeners take care of any vibrations.....yes they cost a bit, but what would you rather have....

Gretch

Jeeze, they cost almost Nothing compared to all the other components, you definately want them and you have not done anything (so far) that precludes your installing them. You must have noticed them on the back of the pads you removed.....Yes? Anyway you can get them from the big three and install them in as little as 15 minutes per wheel. Go the the Nichols site for detailed instructions.

Like Wally, I did my brakes about 500 miles ago, no sqeaks at all......

Jay S.

If you're referring to the 2 round metal disc cup like things that are about an inch thick, that are on the side of each brake pad, then I did use them. They looked fine and about half came out when I took the old pads out and the other half just stayed in place, but they were put back in the space where they came from and are definitely still in there.
I put the anti-squeal goo on the backs of the pads where it touches the backs of the dampners (if the dampners are what I think they are).
I am by no means a mechanic and brakes are about as much as I would do on my own. The directions from the various sites were really good, so I went for it, and everything went just like the instructions said.
Could excessive brake dust or maybe not enough anti-squeal stuff cause this? I can lift the car in no time now and take off a wheel to check.
Thanks for the help.
Jay in Az

Hans SerVaas

Same situation here, brand new mintex pads, brand new dampers, horrible squealing. I did not use any paste. Should I?

MikeN

Jay -

If some of the old dampers stuck to the pads and some didn't, I would say that someone had tried to reuse them in the past, maybe more then once,
and they are not sticking/performing like they should. I hate to say it, but you may want to get new ones (dampers) and try it again....this time cleaning everything including the caliper pistons, etc. With the "everyting new" setup you don't need any anit-squel paste/goo.

Hans -

I have the same setup on my GT, and it is quiet
95% of the time. Did you use a new or turned
rotor? I have made it a rule that I will never
put a new pad on rotor that is not new or turned, just has never worked out right for me that is.....either they are noisy or pull. I just don't even attempt it!

Gretch

The dampners are attached to the pads with an adhesive. that way when the rotors kick the pads back they stay "back" and they never ocillate (metal to metal) on the caliper pistons.

Jim bailey - 928 International

with only 50 miles of driving they are not " bedded in" unless you deliberatly did so . The old worn rotors were not flat/smooth and may have had a wear ridge near the outside circumference where the old pad did not contact the rotor . You should follow the Porsche recommended procedure to break in new pads .... basically " brake pads need to be used for about 200 kilometers before they develop their optimum friction and wear characteristics . During this time , avoid full brake applications unless an emergency arises" ...." ...bedded in by applying medium forces at larger intervals.." It takes some rather hard braking to get up to the "medium forces" level mentioned above followed by a cool down period during which never hold the car at a stop with the brakes ON ! that may warp the rotors . It is even harder to bed in brakes if both pads and rotors are new .

Big Dave

Can someone post a picture of what the dampeners look like?

I'm sure it would be helpful for those who don't know if they have them.

BrianG

Has anyone observed that some brands of brake pad are noisier than others, and some throw more brake-dust than others?

I have certainly noticed this on motorcycles, where the higher-metalic pads are noisier and throw more dust, while the higher-organic, and the new ceramic pads are both less noisy and less dusty.

If this is the case with the 928 as well, id appreciate forum member's opinions of the better "brands"...........

Jay W

Ceramic pads are suggested for cars with custom wheels etc because they produce less dust and help cars with chronic brake noise problems. Dont know if there is a porsche approved specific application for our cars though.

Jerry 87 928S4

Dampers, picture from 928 INTL.

<img src="http://www.mailordercentral.com/928intl/images/92835109619.JPG" alt=" - " />

I found that I had to clean up a lot of brake dust to get the shoes to insert freely and I used these these dampers. The insert in the caliper and stick to the pad. Not sure they could be reused?

WallyP

While we (and the other vendors) would be happy to sell you a new set of pad dampeners, and that is certainly the easiest way to do it ...

Yes, the dampeners can be reused.
Open a bleed screw and push the caliper pistons back into place, closing the bleed screw immediately.
Clean the calipers, especially the areas where the pad backing plates touch.
Lube the areas where the backing plates touch the caliper body - not the pistons!
Install the rotors and calipers.
Clean the backing plate of the new pads and clean the dampeners,
Install the dampeners into the piston openings, making sure that you have them in the correct piston - they are all different sizes.
Apply a small dab of high-temp red RTV silicone to the dampeners on one side of the caliper, and immediately install the pad, pushing it into firm contact with the dampeners. Repeat on the other side of the caliper.

It is strongly recommended that you completely flush the old brake fluid, including the clutch system if you have a five-speed.

Bruce Sinclair

One thing to keep in mind when getting rotors turned is that there are very few shops that have the ability to refinish a rotor as smooth as it needs to be to prvent squeeling