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Strange Noises? Help!

In message <UPMAIL06.199608290421280153@msn.com> "PAT MARTIN" writes:

> Between 61 and 65mph I begin to hear a rhythmic hum emenating from the front 
> of the car.  It is quite loud.  In fact, if I had a non-Audi person in the
> car and I was trying to impress them with my expensive German metal, they 
> definately would not be impressed.    The only thing I can think of is the 
> tires.  At about 67 mph the noise begins to go away, until at about 72 
> mph the noise is gone entirely.

Some form of frequency-dependent vibration that _doesn't_ show up as tyre 

This is a wild guess - are the brake caliper carrier retaining bolts worn?

These are basically secured rods on which the carrier floats to accomodate 
caliper tolerances when braking - there are two on each caliper.  Usually wear 
shows up as a mild "clank" when hitting a pothole.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club