weird abs/ brake noises

[Dan Cordon]

 >ive got some funny brake noises + i wonder if anyone might know whats 
 >up..
 >
 >when backing down a steep + slippery [snowy or rainy] hill,
 >driveway, etc and if i  brake adn the tires slip [i can feel them
 >slip and feel the abs start to work] i get groans and pangs from the
 >vicinity of the MC
 >is it a sign of a bad mc or abs pump [or whatever contraption it is
 >that drives the abs]?

That actually sounds normal for the ABS system. First time I heard it 
was when playing around in snow. Scared the buggers out of me! However, 
when my other quattro made the same noise I figured it was okay. Most 
every ABS system out there vibrates the pedal, but the springy twang was 
new to me.....must be an old audi thing. :o)

-- 
Dan Cordon
Mechanical Engineer
University of Idaho - Engine Research Facility