steering judder

Arkious · Jul 4, 2017

Hey Chaps,

I think I already know the answer to this question but I am going to ask it anyways incase there is anything else that could be causing it. Basically when I got my 8P I had brake judder caused from what Audi said was the brake discs, now 6 month on its back and I cant understand why. I remember John telling me that when the holes are blocked it can cause bother, but I checked and they are certainly not blocked. I also upgraded to Redstuff pads to prevent them blocking.

Now I have a very light judder when driving anyways and want to get my geometry checked out, but what are the odds that a disc is warped again? I've drove around 4000 miles since having them installed by Audi (will they be covered under warranty?) would braking make a geometry issue seem worse?

Thanks,
Jay

45bvtc · Jul 4, 2017

Arkious said:
Hey Chaps,

I think I already know the answer to this question but I am going to ask it anyways incase there is anything else that could be causing it. Basically when I got my 8P I had brake judder caused from what Audi said was the brake discs, now 6 month on its back and I cant understand why. I remember John telling me that when the holes are blocked it can cause bother, but I checked and they are certainly not blocked. I also upgraded to Redstuff pads to prevent them blocking.

Now I have a very light judder when driving anyways and want to get my geometry checked out, but what are the odds that a disc is warped again? I've drove around 4000 miles since having them installed by Audi (will they be covered under warranty?) would braking make a geometry issue seem worse?

Thanks,
Jay

Just last week I had a similar issue, Jay.

As the professional said to ALL at our Silverstone experience day "you people just don't brake hard enough with STD brakes" and for me that's certainly true as I for sure don't brake hard enough to keep the discs 'clean' - especially on the unseen inside faces of the brake disc.

In my own experience the vibration you're feeling is friction pad deposit on the brake disc and in particular on the inside of the brake disc. It sure 'feels' like a warped brake disc; and last week I had exactly that.

My resolution was/is to use a local A-road and perform three to six heavy brake applications, braking from 70 to 30mph, and then letting 'em cool normally on the drive back home; and that, for me, sorts the issue.

Note: I don't get the same problem on my TT or A1, just the RS3...

Hope this helps...

Arkious · Jul 5, 2017

I generally do brake quite harshly and on a regular basis on my daily A19 blast. Usually quite hot after my commute... ok so the RS3 is fun when you put your foot down haha.

Actually, had the parcel shelf off to transport some stuff and holy crap the noise it makes in the cabbin is awesome!

Anyways back on topic, I'm going to see if over the summer I can lend a DTI and check both discs as for some reason I've always had a hunch that Audi didn't fit the drivers side disc 'true', or that it may have warped.

Anyways I shall try a real hammering tonight on the way home (well if the roads dry up a bit as I don't want to end up the wrong way on the slip road haha)

Will let you know

45bvtc · Jul 5, 2017

Arkious said:
I generally do brake quite harshly and on a regular basis on my daily A19 blast. Usually quite hot after my commute... ok so the RS3 is fun when you put your foot down haha.

Actually, had the parcel shelf off to transport some stuff and holy **** the noise it makes in the cabbin is awesome!

Anyways back on topic, I'm going to see if over the summer I can lend a DTI and check both discs as for some reason I've always had a hunch that Audi didn't fit the drivers side disc 'true', or that it may have warped.

Anyways I shall try a real hammering tonight on the way home (well if the roads dry up a bit as I don't want to end up the wrong way on the slip road haha)

Will let you know

One other thing to check, Jay; run your finger across the 'inside' disc surface (just about get to it at the 12 o'clock) and compare surface 'texture'; the inside surfaces of my front brake discs always feel 'rougher' than the outside surfaces - as though not working?

Mine are 'rough' on the inside now - on the RS3, just run my finger across 'em. But NOT on the TT or A1, checked them too; both TT and A1 have smooth surfaces inside and outside of the front brake discs - both solid discs without slots or holes.

I have thought about deleting the front brake disc dirt shield on the RS3 if only to evaluate; another day perhaps...

45bvtc · Jul 5, 2017

OK, so it's very warm outside and cooler in the garage and here's what I found with the nearside disc off; starting with a full and then detail of the outside face; for me everything looks 'normal (note: car was out and about 3-days ago and is stored in a dry garage):

And now the inside face ; again a full and then detail: you can see difference with holes blocked and surface corrosion - looking like the innerface hasn't been working:

So, I'll be cleaning up the disc and refitting and for sure the dirt shield is off for the time being.

Food for thought, Jay...

45bvtc · Jul 5, 2017

OFF-side EXACTLY the same, Jay; seems as though the inner pad isn't working as effectively as the outer pad, however, look at pad thickness:
NEAR-side inner pad @ 13.6mm, outer pad @ 14.5mm
OFF-side inner pad @13.7mm, outer pad @ 14.5mm
More wear on the inner pad!
Redstuff @ 5000 miles

45bvtc · Jul 10, 2017

6-days on and the difference is 100% PLUS positive! Super SMOOTH brakes with 'bite'.

And the wheels are running so much cleaner: the brake dust is no longer hitting the dirt shield and dropping onto the inner-wheel rim; neither is it clogging the holes on the inner brake disc surface, yet.

But it is the smoooothnessss of the brakes that's so in yer face; unbelievable!

Arkious · Jul 10, 2017

45bvtc said:
6-days on and the difference is 100% PLUS positive! Super SMOOTH brakes with 'bite'.

And the wheels are running so much cleaner: the brake dust is no longer hitting the dirt shield and dropping onto the inner-wheel rim; neither is it clogging the holes on the inner brake disc surface, yet.

But it is the smoooothnessss of the brakes that's so in yer face; unbelievable!

Just by removing the dust shield it made so much of a difference!?

45bvtc · Jul 10, 2017

Arkious said:
Just by removing the dust shield it made so much of a difference!?

No, observing the poor state and then cleaning the inside of the brake disc is what made the difference. In removing the dirt shield I'll be able to better monitor the state of both inside and outside of the disc; hopefully, the lack of a dirt shield will be an improvement; time will tell and it'll not take long.

Took 45-minutes per side to strip, clean, and re-fit.

leshkin · Aug 18, 2017

One thing to check is the mating surface of your brake disk and hub, as well as brake disk and wheel. Make sure that they are clean and free of any paint if wheels were refurbished in the past. I had an ongoing problem of brake judder returning every few months or so. Resurfacing the disks helped temporarily, but in the end, I took it to a brake specialist, who cleaned and resurfaced the wheel/brake disk mating area and that removed all vibrations... It's been over a year and no issues for me.

Arkious · Aug 19, 2017

Thanks for that bit, I was just visiting to ask more on the matter. Im hoping the weather stays nice tomorrow to get to look into it.

Basically I've noticed that I can get fair judder when driving on a road, which turns to heavy judder under breaking. But then I can go round a corner or even over a roundabout and then the steering judder can almost vanish. The road surface doesn't change and there's no knocking when driving, just a lot of up and down movement on the steering wheel :/

leshkin · Aug 19, 2017

Sound like you have multiple issues there....
Brake judder is likely to be disks as described previously.
The judder while driving can be unbalanced wheels, issue with tyre or buckled wheel. Balancing or buckled wheel can be easily checked at any tyre shop when the wheel is on the balancing machine. The wheel should not wobble or have any dips as it is spinning. Check that first before looking at the brakes.

Arkious · Aug 22, 2017

I was going to take it to Halfords Auto centre but decided to just take it to Audi. The brakes were only fitted in Feb by Audi and have covered just less than 3000 miles. I think the car is due its DSG service having had a few missed gear changes as of late so will get that done at the same time.

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steering judder

Arkious

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45bvtc

The Older I Get The Better I Was

Arkious

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45bvtc

The Older I Get The Better I Was

45bvtc

The Older I Get The Better I Was

45bvtc

The Older I Get The Better I Was

45bvtc

The Older I Get The Better I Was

Arkious

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45bvtc

The Older I Get The Better I Was

leshkin

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Arkious

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leshkin

Hold my beer...

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