> This is way off topic
No kidding !

> How can a car with ABS brakes come to a stop in a hill?
>
> Why don't the ABS-system release the brakes when the car stops?

The ABS system doesn't do the braking. Your foot does.
The ABS uses various methods to effectively make you take your foot off the
brake for very short periods.
One way is to pulse a very high pressure onto the line for a short time
which pushes your foot off the pedal.
There are other methods but they get a bit convoluted.

Steve.

======================================================
  Very funny Scotty.  Now beam down my clothes.
======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680                email: steveb@kcbbs.gen.nz
New Lynn, Auckland           ph  +64 9 820-2221
New Zealand                  fax +64 9 820-1929
======================================================