TylerDurden

Guys im on my third set of disks, im thinking of selling the car if I cant get to the bottom of this issue. Car is a jdm bug sti with brembo calipers. So far I have been using Godspeed disks and bluestuff pads. Its like clockwork, take it easy on the brakes for 500 miles, at 1000 miles the judder starts at 70mph, for a few seconds, then over time it gets to the stage where anything over 40mph will give severe brake judder, with the dash vibrating badly, you can see it moving up and down. Im embarrased to have anyone sitting in my car when this happens. Hubs are perfectly clean, wheels balanced and aligned, im easy on the brakes. Some body has suggested a bent hub or broken abs rings? Does this sound feasible? Every garage I have been to just want money to change disks and pads (including subaru), some have suggested skimming the disks while they are on the car, but I would prefer to find out the cause. Thanks

stockcar

you either have a problem caliper (sticky pioston, etc.) or more likely you have a warped drive flange..............
just a daft one also are the rears in fully working order??

alyn

Godspeed Brakes

iTrader: (259)

Do you get shaking in the steering wheel when the dash is vibrating , or just the dash , if there is nothing through the steering then it could be the rears.

If it is the fronts , a drive flange could be out of shape , if so though it would show up straight away even fitting new discs , the only way the fronts would keep doing it after the mileage your putting on them , it can only really be a caliper problem.

With so little mileage on the discs , we can skim them to true them up so no problem there , we can also strip and sort your calipers out to as new condition if needed , see here

https://www.scoobynet.com/trader-ann...-calipers.html

Cheers Ian
01656 723060

alcazar

iTrader: (2)

If I had this, my CAR would go to Ian, above, to sort.

TylerDurden

Hi Ian, there is vibration through the steering wheel but it isnt that much, its much worse through the dash, from any speed above 40mph, how can you tell if its a bent hub? As even the subaru garage are looking at me like im stupid and just want to sell me parts or have the dsics skimmed on the car. Could any other steering issues be the cause, eg a bent steering arm or something like that? Im at my wits end and just want to have fun in the car, a freind with a peugot thinks it might be a broken abs ring? Or possibly suspension bushes ( but I wouldnt know which ones). If you could point me int he right direction on the most likely causes I would be extremly grateful. Thanks

TylerDurden

Hi, the calipers seem to be ok, as the piston move in when pushed by hand, but there is some kind of knock that seems to come from the o/s/r wheel area when I move off low speed. A garage I went to said this is normal and its simply that the pad moves which allows for disc expansion when they are hot. Is this true, as Im wondering now?

Godspeed Brakes

iTrader: (259)

The rear hub can be checked for runnout , they would need to take off the disc and put a DTi gauge on the hub face and turn the hub to see if it is running out , if there is runnout then it would need changing.

They can fit the disc back on and also check the runnout on the face where the pads touch , this will tell you if the discs are running true , this can be done on all four corners so you would know if the hubs and discs are all running true

Is it only juddering when braking ? or everytime you drive over 40 mph ?

Have you had the wheels ballanced ?

Cheers Ian

TylerDurden

Its only juddering when braking, the wheels have been balanced and I have had a geometery set up twice in the last few months due to some suspension mods.

Godspeed Brakes

iTrader: (259)

If its only doing it under braking , its either the discs or hubs , you will have to get them checked out and see where you go from there depending on what they say
If you close to me , I can check it all out for you
Cheers Ian

TylerDurden

Ok Guys, I had the o/s/f wheel baring replaced, apparently the hubs were ok, and then put on some Godspeed disks which I had skimmed. I re bedded the disks in, for 500 miles, however now the judder is coming back. This was the first time I used the brakes very hard, I did reach speeds of 120mph, and after this the judder started to return, I did get some fade with the Bluestuff pads, which im not truley happy with. A day later I went out in the car again, to try and clear the disks by using them hard but has not made a difference. The judder is only bad when the disks are hot. Im thinking I should try replacing the disks once more, if this does not cure it then Im going to sell the car. I will be going for Dba 4000 disks and Carbotech xp8 pads this time. Is there anything else that could be causing this judder?

JAutos

iTrader: (5)

The qaulity of Ians discs i dont think will be an issue, They are good discs and he offers excellent warranties on them. DONT sell the car there will be a simple explanation

matt-c

iTrader: (5)

Thought I'd chime in as I have judder too, just today replaced the disks and now hoping for the best, it's too early to know if it's fixed yet.

BLU

iTrader: (27)

Agreed, I have Godspeed discs and gave them some serious stick on a trackday. Still perfectly true after. Infact I think Ian covers trackdays under the warranty! The problem will be elsewhere and probably something silly. Are all the bushes/ ball joints, rack etc in good condition?

Godspeed Brakes

iTrader: (259)

Hi
Give me a ring on 01656 723060 and I will try and get to the bottom of it , there has to be a reason for it
Cheers Ian

sprigeteer

iTrader: (9)

Keep us posted. I've had a similar issue and would like to find out what has been causing your problem. Good luck getting it sorted - not a lot worse than having a simple symptom and not being able to pin-point the issue(s).

DisoDisp

iTrader: (1)

I've had a similar problem for years, no garage seems to be able to figure it out, neither does changing discs/pads make any difference.

Keep us posted.

Gregsti01

iTrader: (1)

Have you jacked the car up put on stands,then get someone to drive thro gearbox while looking for a wheel running off true.When you fitted the discs did you bolt them down without wheels and dial gauge them to check run out?

matt-c

iTrader: (5)

Interesting link for fellow judder sufferers.

http://www.powerbrake.co.za/tech_inf..._01_judder.htm

grahamc

iTrader: (10)

Very interesting.... We all seem to have the same issue with rather different brake setups.

matt-c

iTrader: (5)

Yep, and my new Godspeed 2 piece are doing exactly the same as my old PF ones.

So is it a caliper, hub or maybe even a fluid problem ? I'm at a loss.

Mine is only an issue when the brakes are hot, feel normal otherwise.

grahamc

iTrader: (10)

Thats not good... Mine only do it under heavish braking... anything else and they are fine (soft and very hard braking is no problem). I have had my calipers refurbed by Ian........ so thinking it must be the hubs

matt-c

iTrader: (5)

OK, I must admit i don't know what could go wrong with the hubs?

There is the mating surface and the bearings i suppose.

sprigeteer

iTrader: (9)

I had a chat with a chap who races BMWs and he said track rod ends without hesitation. How true this is only time will tell. Mine's off to get a full check up at some point in the near future.

scoobytebb

Having the same issue with a similar set up.

I am no expert but my suspicion is that its the compound of the pads

Have you tried alternatives?

Also my disks have stipes on them after heavy braking and the judder only appears once the brakes get really hot.

Generally fine on the road but really bad on track!

TylerDurden

I havent tried an alternative yet, and still no update to post, but I did read a thread a few days ago which suggested the Bluestuff pads may be the culprits in causing judder.

Im really sick to death of this problem now, as soon as I have the Dba discs and new pads I will update the thread and let you all knw the outcome.

matt-c

iTrader: (5)

Not comvinced it's the pads, I've had the same problem with 3 quite different pads now

kenc

iTrader: (6)

Wheel bearing or cv joint maybe??

matt-c

iTrader: (5)

Possibly, would either of those things become more apparent with heat / use?

The car feels normal until the brakes have been used moderately hard a few times, then the judder starts and does not clear until the brakes cool again.

matt-c

iTrader: (5)

I'm getting lines on the disks too, these have only been on a couple of weeks.

TylerDurden

Hi Matt,

I know what you mean about the pads, it is a long shot, but there is a thread where some members have the same problems and the finger is pointing to the pads.

I had a wheel baring replaced by Subaru recently, everything else was checked, and the skimmed discs put on.

They now look exactly the same as yours.

Symptoms are exactly the same as yours too, judder subsides quite alot when the brakes cool down.

I do hope we can get to the bottom of of this and start enjoying our cars.

This is the thread: https://www.scoobynet.com/scoobynet-...d-4-2-1-a.html