ABS Problem on 90Q

[Roger Firor <firor@lf.hp.com>]

> I recently picked up an '88 90 Quattro through a private sale after
> searching many months for this particular car.  The car had 38K miles and
> is in near showroom condition. I am very pleased with the quattro except
> for one problem with the ABS system.  
> 
> During normal braking the ABS system will frequently "kick in".  This has
> forced me to drive most of the time with the system in "OFF".  Also, I do
> not get any indication of ABS malfunction from the dash warning lights.
> 
> Here is my theory on the cause of the problem -
> 
> The car came with 205-60-r14 GT+4's. The diameter of this tire is about
> 1 inch larger than the stock tire by my rough calculation.  Maybe this
> is enough to through off the ABS calibration.
> 
> Any opinions or advice on my problem would be most welcome.
> 
> Roger
> 
>