Hi all,

I have the AP 6 pot kit on my classic. Awesome!

Just a small thing, sometimes when pulling away in the morning, its like the pads have glued themselves to the discs. There is a resistance to movement then a clunk sound as the drive overcomes the pad adhesion and the car moves normally. Sometimes, I also get light steering wobble when lightly breaking from motorway speeds, which would make sense if the pads were leaving deposits on the discs.

Are DS2500s particularly prone to this?

Ns04

 

Its probably the metal content in the pad rusting itself to the discs , as you drive it will clean them up , the pads can leave deposits on the discs sometimes due to hard driving , which again will usually self clean
Cheers Ian

 

Ah, I see! Ta, Ian!

 

Very prone to that.

Search facility on here will show how many people have 'warped discs' from running them.

 

Interesting: it never happened when I had Pagid RS Blacks on the std set up.

I can understand why the deposits would give the impression of a warped disc. I believe you can pagids to fit AP 6 pots and also PF do some in the right fitment, I will just have to upgrade when the current pads are past their best I guess.

Ns04

 

It is the resin used to bind the brake pads together. When they get hot the resin boils and is released onto the disc. This makes it feel like a judder/vibration.

It also makes the pad crumble away prematurely.

PF pads don't do it and last 3 times as long in my experience. Not sure on Pagids as I havent used them.

 

Good article on the stoptech site about it.

StopTech : Balanced Brake Upgrades

 

Lol, I get this with my AP 4pots if it's been standing for a while, esp if the cars washed and left to stand for a day or so..!

I only noticed it at around 60-70mph light braking and was more of a humming than vibration.

Gave them a GOOD thrash, as per the excellent Stoptech article regarding pad deposits, and it goes away..

J

Had 'people' saying all sorts of things, from warped disc's, wheel bearings fubar'd to new pads needed..lol..!

Basically, I don't drive the car hard enough often enough..! lol

BTW don't think about getting any acid based wheel cleaner near them either, as this exacerbates the rusting process..!

PF (097) pads are awesome performance wise, however they're absolutely awful for brake dust..! It actually etches into your wheels..!! You can't actually call it dust, more like molten grit..!lol Padgid's are messy, but at least it's only a dust that wipes off easily.

 

I think I'm going back to Pagis Blacks next time; used to be very happy with them. Nowt wrong with the DS2500's peformance, but that slight steering judder when braking milding from higher speeds is fecking annoying.

I'll give em some stick and see if that helps clear things up. My car is predominantly used for leisure so periods sat around with damp pads is inevitable I'm afraid!

 

BTW I feel I should point out that my pads/discs were bedded in more or less exactly as AP asked. I bet the other traffic on the road wondered what the heck I was up to!!

So it wasn't just me being a larry led foot!

 

Lol, we seem to have very similar experiences in everything subaru we do..lol apart from yours being a classic and mine being a lardy newage..!

Depending on how bad your humming/vibration is it might take some serious 'abuse' to clear it. Initially I did ~8 hard stops- just off abs threshold, from around 50, then another 5-6 from 80ish down to about 20 and this wasn't quite enough. 90% better, but took another 8+ from 80+ to almost, but NOT , a stop.

Lol, these cars and brakes like this need some regular abuse, I'm afraid we're too soft. Must be an age thing, lol..

 

I'm having exactly the same prob with my Prodrive alcons, and Ferodo 2500 pads, so I know what I will be doing tomorrow!

 

just make sure when carrying out any of these aggressive "bedding" or clean ups that you do not simply park up after but continue to drive for 5miles or so to allow the brakes to cool naturally

alyn

 

It is a common issue with Ferodo DS2500's.

Change your pads.

 

I paid 2k for those brakes, I'm bloody well getting my money out of the pads before I have to spend more!!!!!

The AP 6 pots are awesome though; they make you enjoy braking almost as much as accelerating!

 

Been out and done this after the school run this morning (Don't think the kids would have appreciated being in the car LOL!), must admit have noticed a vast improvement now. Thanks Chaps

Brakes called down after Alyn

 

my pads(ds2500) do the same in my ap 6 pots ,weld themselves to the disks,its a bit annoying to be honest

 

They need good regular hard use, especially when it's wet, but to be honest they're actually a good road pad imho. I suppose the problem is, with the roads being the way they are these days, keeping them in shape in this way can be a problem..!

 

I have brake judder and have the ds2500 fitted on the Godspeed 335upgrade. If there is a deposit on the discs, how do I remove it. A few hard stops? I need to sort it before Mot time, end of the month!

 

You cant remove it.

Sometimes getting the discs skimmed will clear it but if the disc material has hardened under where the deposits are the judder will only return.

Change pads to something better and hope the new pads clean the surface

 

PF pads do crumble cos they did it to me and ruined my PF discs in the process!

 

Thanks! What is the chance that this will be an MOT fail?

 

brake vibration shouldn't come into an MOT unless it affects the performance of the brake system

as an aside you can get any pad to "drop-out" or crumble if you excedd their design specifications....most commonly caused by running the material above its design temp for extended periods, not allowing sufficient cooling or simply by having a poorly operating barke system

alyn

 

Go out and give them a good thrashing 6-10 hard almost stops from around 70mph. Try to brake hard enough to almost invoke the ABS, obviously do this when the roads are completely dry.. You should at least see a massive improvement, if not completely eradicate it- lol until next time..!

I found with mine it usually occurred either after washing the car/wheels and then not running the car straight away or if the car had been standing for a while during particularly wet weather..

PF pads (well 097's anyhow) I've tried in the rears and they offered awesome braking performance, but and it's a BIG but I couldn't live with the dust/residue they emitted. It took serious removal and even got onto the paintwork behind rear wheel, turning it a nice shade of pearlescent yellow/blue..! Had to have wheels refurbed it was that bad. Braking wise though they are very good- my car with AP's DS2500's up front ran OE pads at rear for some time and hard braking would cause the nose to dive- even with T25/AST suspension fitted! When I fitted PF pads to rear the car was so much flatter during hard braking, you could feel the rear anchoring down..!

 

I found taking the abs fuse out and finding a very quiet road was far better at cleaning the pad deposits, you can really give the brakes some stick. Funily enough the brakes worked so much better with the abs off and the pedal even seemed firmer.

After several stops to about 10mph as per stoptech advice then drive carefully without applying brakes the pad deposits seemed to clear.

Remember to refit the fuse though after

 

Thanks for the tips guys, Ill give it a go tomorrow. Wish me luck with the MOT as well; I also have a prodrive sportcat fitted and dont know whether the emissions will be good! All fun and games!

 

Used to get similar hassles with my old (now removed) StopTech brake kit. I never used them hard enough half the time so the pads used to glaze over anyway. lol.

 

Myles, make sure the sports cat is absolutely red hot- give the car some serious beans on way to MOT and ask them to check emissions straight away before it cools. All cats only work properly when hot, but high flow cats need to be RELLY hot..!
Good luck..

 

Ill let the MOTer know, thanks for that. He has a few high performance cars so should be understanding to the ways of the sportcat.