[s-cars] ABS shutting down

[Robin Stoddard]

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Curious if anyone else has had this happen.

When I head out and go for a drive and the outside temperature hits ~28
c (82 f) no problems.  However if turn the car off (arrived at Home
Depot), when I start up the car again the ABS & brake light are on.  If
I stop the car, open the hood and let it cool down for about 30 minutes,
then start it up, the ABS & brake light are off (most of the time).

Had the local Audi dealer check into it (when it was not occurring) and
there are/were no faults showing.  Again, this is temperature related as
it only happens when the outside temp is above 25 c (77 f).  I took some
quick temperature readings when this was happening:
  - hood closed, air conditioning on, cooling system functioning
properly, oil and water temps are normal
  - go for about a 15 kms drive (9 miles) of moderate city driving (to
Home Depot)
  - outside temp 28-30 c (82-86 f)
  - temperature near the ABS unit 77 c (170 f)
  - ABS shuts down

Letting the system cool down and the engine compartment temperature
drops to about 43 c (110 f), the warning lights will then go out.

Thoughts????

Robin
96S6