[A4] ABS problem

[Brizax at aol.com]

clean the wheel sensors first, that's what it sounds like to me.
 
 
 
In a message dated 6/9/2008 8:15:50 A.M. Eastern Standard Time,  
4pkirby at gmail.com writes:

The ABS  on my 2001 1.8tq is acting up.  As I am braking, once I hit
around 20  km/h I start getting a few pulsations from the ABS.  It
started out  with just a couple of pulsations/stop but now there can be
many more.   The ABS light does not come on (but does come on at
startup and then goes  off right away, as it should).   A friend
claimed he had similar  symptoms on his 1997 1.8 tq and it turned out
to be broken ABS rings on the  rear CV joints.  On the old 20v.org site
they indicate that similar  symptoms are seen when a wheel sensor is
flakey or too far away from the  rotor.

However, when I hook up either my Prodiag or my local garage's  VAGCOM,
we can only maintain communication with the ABS ECU for a short  period
of time before the connection is broken.  While connected, the  four
wheels are shown as turning equally (both the Prodiag and VAGCOM  give
simultaneous wheel speed outputs).  My garage person feels that  the
ABS module is not good and that needs repair/replacement (I see  there
are a few places on the web that do this).

Any thoughts?   Any other diagnostic tests I can do to narrow down the
possibilities?   I am reluctant to start pulling off the half-shafts to
find out which  one(s) might be the  problem.

Thanks.

Peter
_______________________________________________
A4  mailing  list
A4 at audifans.com
http://www.audifans.com/mailman/listinfo/a4





**************Get trade secrets for amazing burgers. Watch "Cooking with 
Tyler Florence" on AOL Food.      
(http://food.aol.com/tyler-florence?video=4?&NCID=aolfod00030000000002)