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hi

had my a5 3.0 tdi quattro sport 5 months and had vibration issues ever since.

had new tyres all round, new rear discs and pad (pagid) just had new front discs/pads 3-4 weeks ago after they diagnosed a braking judder from 80 as a disc with a lip on it wher the pad has worn ? every thing was fine for a week after new discs n pads then started getting vibration so took it back they said warped so they skimmed them free of charge and all has been well for past 2 -3 weeks untill today when on the motorway i noticed it again and it didnt take much pressure on the break to make it happen, the harden i press the harder it vibrates through car and wheel from around 80mph.

if i break all the way down to say 40 from 80 i get bad judder through car and wheel all the way to when i stop breaking but if i break from under 60 to 40 its fine, and im not talking mega hard breaking, im breaking just normal and not excessive

so going to take it back and tell them its happening again. see what they say..

iv had them inspect all other aspects of the car that could cause this, so every thing on the front end has been checked and inspected for any cracks/breaks/bends, all ok

my allignment is slighlty out but the car drives straight. the rear alliugment bolts are seized.

when i first got the car i was told off a wheel garage i had a slight buckle on 1 or 2 wheels, but from reading threads i believe a buckle would not make the car and steering wheel shake and vibrate when breaking ?? but i may be wrong ???

doesnt seem to do it when cold.

had the usual vibration problems when driving between 60-80mph and had the wheels balance 5 or 6 times at a number of places and it is still their but not that bad after audi specialist did it last time, i put this down to the possible buckle even tho audi specialist say they didnt see a buckle ? strange so i am currently looking for a set or 19" rotors too to solve the vibration between 60-80 hopefully..

so anyone got any ideas other than it being warped discs?
 

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My car is the same, A5 3.0 tdi quattro.
Around 60-90mph light breaking, I get a vibration as far as a shudder.
I'm running Michelin pilot sports all round, brand new. 20" RS5 wheels, I've new bottom arms, curvy arms and pads all round.
I'm going to change the rotors next week and see if that helps and then if not move onto the steering rack bushes.
I get a metal on metal cracking noise when I turn through full lock under the car, I'm hoping it's the rack bushes.
After that I'm out of options.
I hope I get to the bottom of it its driving me crazy.

I'll let you know how I get on.
 

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Hiya both. Listen brake discs/rotors very rarely warp unless your name is Lewis Hamilton or something. You need to have your bent wheels reworked for sure cos they are a possible cause. Then you must ensure that your brake pads are suitable for your rotors. Ideally use the same brand, I recently fitted new rotors and pads to my S4 at 190k kms and I fitted Brembo all round by choice, I found the standard ones very good but I prefer the feel that Brembo gives.One reason for vibration comes from a build up of deposits on the rotors, they can be cleaned off in many ways.
 

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I'm guessing the OP has resolved his brake issue after 7 years!
But this kind of issue is normally down to fitment or user error. Sometimes you can get deposits as Simon says, and try some big heavy braking to try and clean the brakes up. Also it is good to get the discs really hot so they blue, this makes them harder as it acts like tempered steel. :)
 
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My car is the same, A5 3.0 tdi quattro.
Around 60-90mph light breaking, I get a vibration as far as a shudder.
I'm running Michelin pilot sports all round, brand new. 20" RS5 wheels, I've new bottom arms, curvy arms and pads all round.
I'm going to change the rotors next week and see if that helps and then if not move onto the steering rack bushes.
I get a metal on metal cracking noise when I turn through full lock under the car, I'm hoping it's the rack bushes.
After that I'm out of options.
I hope I get to the bottom of it its driving me crazy.

I'll let you know how I get on.
When does the knocking noise occur? when turning the steering wheel or when turning full lock at slow speed?

Shakes or judders when braking is normally the brakes, get them checked. Although worn suspension arms can give same effect.
 
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