A6 Handling Question

[Greenday]

I have a 58 plate A6 3.0 Tdi Quattro Le Mans with 85k on the clock.

About 2000 miles ago, it developed a very pronounced vibration when braking which was cured by new discs and pads to the front (discs and pads had already been replaced at the rear about 2k miles before).

Recently I'm experiencing a vibration in the steerting which is light during higher speed straight line, a bit more pronounced and through the brake pedal as well as steering when straight line braking and very pronounced through the brake pedal and steering when braking and cornering at the same time (coming into roundabouts mainly).

If i'm travelling on a smooth surface at 50mph + I suspect that I have some wheel bearing noise (although it could be tyre noise I suppose). The sound proofing on the car is excellent so I'm not really sure what I'm hearing.

Not expecting the discs to have warped in 2k miles (is that a reasonable assumption???)

Could this be shock's/wheel alignment/bearings/another suspension issue???

Any ideas??

[74merc]

I had similar symptoms in my Subaru and found it to be the wheel bearing. I would get the car off the ground, take each wheel in turn and spin it by hand listening for any noises. Also check for any movement. Either or both would point to the bearing.

[Dr G]

Seemingly random wheel bearing failures on C6 A6s aren't uncommon so it's quite likely you've found the problem.

Very often just one will go (even with quite low mileage) and the others will be perfect.