Brake noises and problems

[JJRS4]

According to Pagid's blurb, Yellow pagids are LOW disk wear.


RS 19 – YELLOW Friction Level Cold 0.40
At 100°C 0.43
At 300°C 0.47
Max 0.49 @ 550°C
Constant working temperature 400 - 700°C
Max temperature for short period only 750°C

This material provides very good performance at all temperatures with immediate brake response. Very stable pad on ceramic base, with excellent fade resistance and low disc wear. Suitable for endurance racing, or applications where exceptional life is required.

[Andiroo]

Yes but LOW disc wear compared to what? Your statement is incorrect and misguided. It's all relative JJ. What hard wearing pad are you comparing it to to make this statement? The description does not say it is suitable for road use.

Go to a Porsche dealer and ask for an abrasive pad for trackdays that takes time to warm up to operating temps you correctly state - 400-700, and they will give you a Pagid Yellow or Sport Yellow (split down the middle). Same goes for Brembo, Sportec and Movit. They all can't be wrong [img]images/graemlins/tongue.gif[/img] .... and indeed aren't!

Furthemore JR has stopped using the Yellows because they are TOO abrasive........ and he has less experience of the Yellows than me. Also Bushy has stated the same from experience

I will state again, the FACTS, by experience (coz I use these all the time for trackdays and NOT road), is the Pagid Yellow is NOT a suitable road/fast road pad - it takes too much time to warm up to operating temps so 1)will wear your discs too much if used this way and 2)you may end up in a ditch coz you will not be up to the effective operating temp [img]images/graemlins/frown.gif[/img]

Andiroo

[JJRS4]

Sorry, I am sure you are right. I just read the Pagid blurb and recited it word for word. What I don't understand though is why Audi are fitting these as standard on the quattro gmbh brakes when they must know that they are too abrasive for the disks, which seems to be the case with Chris's disks.

Are you saying that the Yellow's are OK for tracks days or not at all?

[Andiroo]

No need to apologise mate, Audi are very confused when it comes to brakes [img]images/graemlins/nodder.gif[/img]

That's right JJ, the advice I have followed is that Yellows (Pagid or Jurid) are great for trackdays but not for the road, which is something at least me, JR and Bushy have experienced.

As for Audi putting these pads on the GmbH upgrade I don't know why, even AmD advertise them with yellows on their website, but [email]Scott@AmD[/email] would certainly say these are not ideal everyday street pads. There again the GmbH upgrade is pants on the track as well as the discs warp easily and the OEM calipers ar just not up to the job the yellow pads will call for [img]images/graemlins/frown.gif[/img]

Maybe the answer is Audi know sweet FA about brakes [img]images/graemlins/wink.gif[/img] mmmmmmm............. think that's it you know!

Andiroo

[TarmacTerrorist]

I have green stuff pads on the front which were on the car when I bought it. I've already had the front discs replaced under warranty because they had warped but strangley they did not replace the pads for oem? I noticed at Dony, the guys with the standard brake pads on left a lip on the outer edge of the discs, the green stuff I have on run the discs smooth to the edge, is this correct?

Vinny.

[Andiroo]

The green stuff pads are fine mate [img]images/graemlins/wink.gif[/img] probably not the best for trackdays but a good compromise between road and track. You will not notice any definite disc wear for a few k miles yet, but they will wear a lip onto your disc like you have seen. The position of the pad in the caliper will always make this disc lip occur. Don't feel left out, it will happen Vinny [img]images/graemlins/nodder.gif[/img]

Andiroo

[TarmacTerrorist]

Not so Andiroo, the discs that came off under replacement were smooth to the edge aswell?

When I bought the car in May, I initially thought it had a brand new set of front discs on (no lips) and the pads looked new also, approx. 15mm of meat. I did 4k+ before having them replaced and still there were no lips, smooth discs to the edge?

Vinny.

[Andiroo]

That's strange, I wonder if the green pads are bigger than OEM then and actually hang over your discs? Always seen worn RS4 discs with a lip.

Andiroo

[TarmacTerrorist]

No inner lip either!

[Andiroo]

If you don't have an outer lip then that makes sense mate - 1st one I've come across though [img]images/graemlins/tongue.gif[/img]

Andiroo

[Bushy]

I would actually say the paggid yelllows are OK for a fast street pad, as an effective braking material

I used them for 6000 miles with no real useage problem and they worked fine when cold

However I still state the pad material wears less than the disc and IMHO the pads should be hte serviceable part not the more expensive disc

I hope to have the 6 pots nad the cooling ducst fitted for Germany [img]images/graemlins/wink.gif[/img]

Cheers

Bushy

[ChrisVee]

Yes but even if my brakes make the whirring noise they are very good for stopping even if they are cold. I do not believe these pads will drive you into the dich. My brakes stop very well even cold or hot. My trouble is this noise that comes when i use them with some vibration that i only feel just before I am stopping. I did go to the audi dealer and they say they can do nothing with the whirring noise, it is normal for competion brakes. So i do nothing

Maybe i must put the standard disks and pads and enough of these special ones. How about I use standard pads with the quattro disks?

I like my new rs4 but this trouble is making me unhappy.

Thanks you for all your very good help.

[Andiroo]

IMHO I would use OEM pads for the GmbH discs not the Pagid Yellows Chris, but this is from my experience only.

It may well be that the Pagid Sport Yellows I am using for the Sportec/Brembo/Movit setup are a different animal in the OEM shape and caliper. I have to say Bushy I DO need to warm these up, and as an example will not use these for the Bruntinthorpe top speed day - they are not efficient enough in the one off braking distance allowed, I'll be using the OEM 996TT Blacks that I have [img]images/graemlins/wink.gif[/img]....... nevertheless Chris your front discs look like they need replacing and the rear noise could be the inner housing or exhaust mount - have you checked these mate?

Andiroo