Resonating brakes

james berkeley · Jul 7, 2017

My car is a Cupra 280 Sub8. The front pads were replaced a little while ago and since then I get the most annoying noise from them when crawling along very slowly in traffic (<10mph). The noise is like rubbing your finger round the rim of a glass and can get very loud. It stops the instant I touch the brakes, only to immediately return when I take my foot off. Really hitting the brakes hard at speed does not cure it (I thought it might be glazing of the pads).

Any other Sub8 owners experienced this - or any suggestions for a fix?

Thanks!

james berkeley · Jul 19, 2017

Mmmmm - I'm guessing very few people have the Sub8!! In the meantime the dealer has dismantled, cleaned up and re-assembled the front brakes. NO fault was found but the noise has disappeared. Here's hoping it was "just one of those things...."

Cupra Belfast · Jul 19, 2017

Brembos

I have the Brembos on my 280 ST. Not had any bother with them so far. Sorry, hadn't been on in a bit.

steveo59 · Aug 22, 2017

my sub8 had to have new discs and pads after the discs warped. and now 6000 miles later my car is doing exactly the same as your car James i took it to a vw specialist he stripped the brakes and re assembled the noise went away for around 500 miles but now its back louder than ever!

vantanev · Aug 23, 2017

My started doing the moaning recently (at around 19 000 km), and it got worse with time (front left).
I have ordered new rotors in anticipation of having to replace the original ones, but if replacement does not fix it....

steveo59 · Aug 29, 2017

Just been into the dealership today. My replacement discs have warped after 6000miles. The case has now been referred to seat uk. If anyone else is having this issue please inform seat so that something can be done!

AndrewJB · Aug 29, 2017

Common fault with them, that kit is the TTRS brake kit and it was common on them.

steveo59 · Aug 29, 2017

Would upgrading the discs solve the problem? I can't believe they won't cover it under warranty

AndrewJB · Aug 29, 2017

Problem with performance discs is they do need to be driven hard. My brembo kit is juddery/squeals.

vantanev · Aug 31, 2017

AndrewJB said:
Problem with performance discs is they do need to be driven hard. My brembo kit is juddery/squeals.

I am unsure what you mean here. Is it expected to not get warping if you drove them hard?

I had to have mine replaced at 21k kilometers, only 15 months into owning the car, and was refused warranty, so it was out of pocket. This does not seem reasonable to me.

AndrewJB · Aug 31, 2017

No I mean people complain about them squealing etc but thats how they go.

Warping shouldn't happen but the TTRS kit is notorious for it. it could also be a build up of pad compound in the grooves which is what I have with mine.

Your very unlikely ever to get warranty on brakes.. they are a ware and tear item.

vantanev · Aug 31, 2017

I don't mind the squealing, but I did not count on needing to fork over 1000 euro on disks + pads every year or so :-/

In my case, the disks had gotten fairly noticeable radial grooves + some extra side to side wrapping. I might have been able to have them machined, and will try that first if it happens again.

Syndrome · Sep 2, 2017

james berkeley said:
My car is a Cupra 280 Sub8. The front pads were replaced a little while ago and since then I get the most annoying noise from them when crawling along very slowly in traffic (<10mph). The noise is like rubbing your finger round the rim of a glass and can get very loud. It stops the instant I touch the brakes, only to immediately return when I take my foot off. Really hitting the brakes hard at speed does not cure it (I thought it might be glazing of the pads).

Any other Sub8 owners experienced this - or any suggestions for a fix?

Thanks!

Had the exact same issue culminating in a pretty nasty warp on the front drivers disc, as AndrewJB said it is common with the TTRS brakes that are used in the Sub8 pack.

After bumbling round some threads on the TTRS forums it seems the discs are the culprit and are seen as "a bit naff", comical for such a highly priced extra! Users who have upgraded to uprated discs (such as Tarox) seem to have avoided further issues, they are usually around £900, as the standards are £600 I suppose it makes the hit slightly easier to swallow.

My solution was to have the front discs reskimmed on the car when I had my pads changed at 20k and was nearer £100 (not inc pads), the car is going back and an ST 300 is taking its place soon so it seemed silly to shell out £600 - £900 on something the next owner will get to enjoy more.

mmcg · Sep 3, 2017

Performance brakes need to be driven hard. Really hard!

vantanev · Sep 3, 2017

mmcg said:
Performance brakes need to be driven hard. Really hard!

I have no idea what you're trying to say here. Looking at audi forums, people complain of these disks sometimes warping even after a singe track day. So it's not like driving hard = no warping.

Is it meant to suggest that it's OK for disks to go bad quick, because they're performance? There are other performance disks, at similar enough prices, that do not warp like this.

Incidentally, mine were driven quite hard. And that did them in. They are evidently just bad disks that literally melt when put to actual track-like usage.

Maybe they can be stripped. I will probably take to inspecting them and stripping on each pad replacement, and see if that is enough to keep them usable. Car is on a lease, so I do not want to put non-OEM parts in it.

Count Drunkula · Sep 3, 2017

From what I've read about them the issue is down to the fact the rotors are not asymmetric. In that the internal cooling vanes face the wrong direction on 1 side of the car (usually on drivers side from factory) because the discs are identical for both sides .

Mtec offer a 2 piece floating setup for replacement for similar price to stock rotors

Count Drunkula · Sep 3, 2017

http://www.mtecbrakes.com/brake-dis.../tt-2-5-tt-rs-quattro-355bhp-07-12-06-15.html

vantanev · Sep 4, 2017

Count Drunkula said:
From what I've read about them the issue is down to the fact the rotors are not asymmetric. In that the internal cooling vanes face the wrong direction on 1 side of the car (usually on drivers side from factory) because the discs are identical for both sides.

Indeed, in my case the one that was more affected was the one on the driver's side, with the vents pointing in the wrong direction, but the other also had grooving.

Count Drunkula · Sep 4, 2017

Dunno if there's any brake ducting available for the mqb platform but it would certainly help

Syndrome · Sep 4, 2017

Count Drunkula said:
From what I've read about them the issue is down to the fact the rotors are not asymmetric. In that the internal cooling vanes face the wrong direction on 1 side of the car (usually on drivers side from factory) because the discs are identical for both sides

Now you mention it that does ring a bell, my experience certainly tallies up to this as it was that side that went. FYI they had no track days (shame on me I know) and *ahem* spirited driving where I would always take it steady before parking up to let the brakes cool.

Another thing that probably won't help some of us (particularly DSG cars) is being sat at lights with the brakes on as it will help trap heat in a localised area. I noticed mine was noisiest in stop start traffic even if I braked very gently and stuck it into neutral as fast as possible.

FWIW I try knocking it in neutral any time I stop at lights now and pulling the handbrake.

I have had a few cars with big brakes (Brembo and AP) and these are the most fickle I have dealt with.

Resonating brakes

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