Steering Noise When Turning: Causes & Fixes

Hello!

Last week, I bought a "new" car: an A4 B7 02/2007 3.0 TDI quattro (ASB) with 84,000 km.


When I start driving (in first gear) or when I take a turn with a sharper angle at a slow speed in second gear, it sounds like something is scraping or rubbing at the rear of the vehicle, and at the same time, I feel a slightly increased rolling resistance.

Is this a sign of a malfunction, or is this normal behavior for a Quattro?

The tires are evenly worn, and otherwise, the car has no defects.


Sure, here's the translation:

"Thx."
Michael.

Hello,

Vehicles like the Quattro models with a self-locking center differential (Bx, Cx, Dx) or the Q5 and Q7 can sometimes introduce a slight vibration from the center differential into the vehicle.
When taking tight turns (turning, maneuvering), the center differential essentially slips, meaning it tries to lock up and then exits its normal locking range. This behavior is normal and inherent to its design.
In vehicles with fully open differentials (i.e., non-locking), this phenomenon doesn't occur. Instead, on snow or wet surfaces, if there's a difference in friction between the tires, the front or rear axle – whichever has less grip and/or axle load – will tend to spin faster, requiring the ESP's braking control systems to intervene sooner. This is where the locking effect helps, as it can compensate for a larger difference in torque, keeping the axles coupled for longer (i.e., preventing individual wheel spin) => resulting in more traction.

These parts rarely break.
So, have lots of fun with your quattro.
Best regards.
heating fossil.