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  1. Car wobbling when braking 
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    Hi, I have a A6 Avant and at high speed when I gently press the brake the car wobbles/shakes.
    It doesnít do it if I press the brakes hard, and it doesnít tend to do it until Iíve been in the car a while (20+minutes).

    It did it this evening around 60mph and I didnít feel it doing it much below that speed
    In comparison the other day it tended to do it at all speeds but again only after a certain time and only started once I was above 60ish.

    Nothing at all is felt through the brake pedal or the steering wheel.


    Any suggestions? Warped discs?

    Thanks for youíre helping
     
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  2. Re: Car wobbling when braking 
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    I'd check for damaged tyre sidewall first, a cut or missing a (small) chunk.
     
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  3. Re: Car wobbling when braking 
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    Yep,, discs are on their way out. Get them the thickness checked and if its close to the minimum then get them changed along with the pads
    A6 BiTdi Avant MTM
    Retrofitted: Full Led Headlights, DAB, Full Electric Seats, Power Tailgate, Surround View Cameras, Genuine RS6 Grille, RS6 Seats,Leather Door Armrests, Soft Close Doors, Rear Side Blinds, Electric Steering Column, LED Sill plates,Ambient Lighting Pack, High Beam Assist, Eibach Springs, Led Roof Console, 4 Zone Climate, Rear Heated Seats, Head Up Display, Side assist, Alcantara Interior Retrim
     
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  4. Re: Car wobbling when braking 
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    Quote Originally Posted by Roverfan View Post
    I'd check for damaged tyre sidewall first, a cut or missing a (small) chunk.
    Thanks Iíll take a look.


    Quote Originally Posted by morski View Post
    Yep,, discs are on their way out. Get them the thickness checked and if its close to the minimum then get them changed along with the pads
    Do you reckon itís the rears?
    Any explanation to why this seems to only occur after a period of driving? Iím assuming itís once heat has built up but surely if they are warped it should be occurring all the time?
     
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  5. Re: Car wobbling when braking 
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    Have the disc runout checked.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
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  6. Re: Car wobbling when braking 
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    Could be a combination of anything, slightly warped discs, worn discs, worn pads, sticking piston on a caliper? Need to get them measured and checked for run out
    A6 BiTdi Avant MTM
    Retrofitted: Full Led Headlights, DAB, Full Electric Seats, Power Tailgate, Surround View Cameras, Genuine RS6 Grille, RS6 Seats,Leather Door Armrests, Soft Close Doors, Rear Side Blinds, Electric Steering Column, LED Sill plates,Ambient Lighting Pack, High Beam Assist, Eibach Springs, Led Roof Console, 4 Zone Climate, Rear Heated Seats, Head Up Display, Side assist, Alcantara Interior Retrim
     
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  7. Re: Car wobbling when braking 
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    As said above, and buckled wheel (very easily done if running 20 inch), bent hub, and damaged or badly manufactured tyre.
    Also worth checking the shock absorbers, as a dud one will cause wheel bounce at certain speeds, especially if something is out of balance, as it will hit resonant frequencies, which will change as the tyres and shocks warm up.
     
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  8. Re: Car wobbling when braking 
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    Iím guessing as itís only occurring whilst braking it wonít be a buckled wheel or tyre issue?!


    Anyway, I had a guy I know put it on the rolling road down at his garage and he said the rear discs and pads need changing so I went and got the parts and did it yesterday.
    Unfortunately the issue remains 🤬😤😔
     
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  9. Re: Car wobbling when braking 
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    Quote Originally Posted by Benish7 View Post
    I’m guessing as it’s only occurring whilst braking it won’t be a buckled wheel or tyre issue?!
    Not always - I've had a bent hub on an A6C5 that only vibrated when hard braking, and only last week had 2 new tyres on my van, and finally the shaking between 30mph and 60 mph has gone, the weird thing with this, is the shaking only happened during hard acceleration, and it had been like it for 2 years.
    Tyres can be guilty of all sorts of odd behaviour, I've even had a couple that sounded like a knackered wheel bearing, i.e. howls and moans.
    It may be worth swapping each wheel for the spare and see if it goes away....
     
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  10. Re: Car wobbling when braking 
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    When we have an issue like this we always runout check the hubs before fitting new discs, it is no use fitting new discs to a warped hub. The spec is 0.03mm and we measure both sides of the bolt hole.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
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