dan83590

As said. I need some technical help.

I was getting shuddering through the brake pedal so I changed the front discs. Problem is, with the new discs fitted its no different.

Can I have some positive help please guys, I'm at my bloody wits end with it.

Dan.

Also read My other thread

sti 360

iTrader: (1)

mine did that when i had new ebc setup,changed to brembo calipers and discs from jap parts and iy does it no more ,
wheel balancing or bushes perhaps
matt

silent running

Well by changing the discs, unless you've warped them straight off, you've ruled them out as the problem. Leaving either the pads or the calipers. Presumably you checked your old pads for flatness and depth before refitting?

ZEN Performance

I would say you have a bent hub flange. I have seen this a number of times, it can be highlighted with new straight discs replacing old ones that have worn in line with the bent hub.

The best route forward is to get the hub checked for runout, and the disc, and see what's what.

Paul

dan83590

I only drove a few hundred metres and turned round and came back. The existing look okay, they are quite new still.

dan83590

Something I should have mentioned in my first post.. There is a noticable knocking when driving slowly over bumps, shocks are new though. Noise is from both sides.

If the wishbone bushes were perished would it cause judder under braking?

codfather

iTrader: (1)

i too have ailar problem, even after upgrading to 4 pots, so calipers & pads not an issue with mine..plus my hubs were checked for run out by glen @ carnetix and their was no issue their
*sorry for hijacking the thread*

dan83590

No apology needed. Does your car make noises over bumps too? Have you had the Bushes checked?

dan83590

Up.

scooby-k

hi Dan. I would get balancing checked on wheels as it is fairly cheap to do and will eliminate the wheels. Garage should also be able to check for play whilst they have the wheel off.
good luck ken

dan83590

I need new tyres on the front. Passenger worn more if that means anything. I was going to get the wheels balanced with the new tyres fitted, but don't want to get new tyres until this problem is fixed.

The thing is, this vibration isn't just slight, its really quite violent between 50-40mph. With that in mind I'm not convinced that the balancing is at fault.

So far I've:
Changed track-rod ends
Changed front shockers
Changed Pads
New Discs

What next??? Wishbone bushes??? Sledgehammer???

feRRetboy

iTrader: (3)

whilst i was road testing my WRX before i bought it, i noticed quite a violent judder too. I had the garage chnaged the discs and pads before i was happy. It sorted the problem, but 1500 miles later i can feel it creeping in again, not as bad but is definately there. Havent investigated it yet, but something is not right for sure. Good luck with finding your problem

scooby-k

try changing wheels put rear onto front see if it changes anythink. got to be a process of elimination. You know its not the disks cos u changed them swop wheels over to eliminate them.

Big_Papa_T

Could it not be your rear discs that are at fault?

ZEN Performance

I think listening would be a good start.

dan83590

Thanks for that!

So what are you saying?

dan83590

Apart from Discs, the things I have listed there have all been done in the last 12 months to rectify other problems. The shuddering at the pedal is fairly recent.

dan83590

Good idea. I'll do that today, lets hope its that simple eh?

dan83590

Rear discs were changed about 16 months ago.

Steve001

iTrader: (7)

let me get this right........... the judder only occurs when you brake??? or just when your driving along?

if its the later, when you driving, does the judder only come at 40-50? does it get better when you go above this? if so i would look at the wheel balance.

if its only under braking then i would have someone check bushes, alignment and shocks.

steve

dan83590

Yep only under braking, and it is worst from 50mph - 40mph. I am arranging to get the Hub's checked and also check bushes at the same time. Hopefully this will show the fault..

Steve001

iTrader: (7)

does the judder feel like ABS? dont rule out a fault here

s

pull the fuse from the ABS system then try it

dan83590

Doesn't feel like it. The whole cabin and the steering wheel shakes.

Aztec Performance Ltd

iTrader: (234)

As Zen said. Check the runout. Most tyre/brake places should be able to do it.

dan83590

In hand. Will post conclusion.

King Eric

Hey Dan, mine has been doing this for a while. No end of things been tried to work out what is wrong including new brakes all around wheel balancing, new tyres and even had the prop checked as sometimes the weights can come off or something (by swapping it around 180 degrees)....Nothing has fixed it. Mine is at around 80 and fairly violent as well, it does not get any better either. It may be a buckled wheel, although nobody has managed to identify that. To be honest, I think the next step is literally trying it with all the wheels replaced

I'll let you know....Maybe you could let me know as well?

bruce

iTrader: (5)

A similar thing happened with my my97wrx, it turned out to be a buckled hub flange. I took my car to a local tyre place that could skim discs on the car, thinking a skim would fix it. The problem was really apparent when the hub was spun up to skimming speed.

codfather

iTrader: (1)

well im looking on with interest as iv got the same problem and its also proven pretty costly..had geometry setup, new disc's x3 uprated calipers, checked hub run out..so looking for some inspiration

dan83590

I managed to borrow a Sealy Indicator Dial and Magnetic Stand in order to check the hubs for any run-out. With all the dirt cleaned away maximum run-out was 0.04mm so I don't think the Hub's are faultly.

What should I try next?

500

Wheel bearing?