Brake reg. setting on rally cars

[Aleksander Mierzwa <alex@matrix.com.pl>]

I have a question for listers familiar with rallies, autocrosses etc. I
was watching TV coverage of some local rallies and noticed that all cars
(no matter if FWD or AWD) would lock their rear brakes first. I
understand that on street cars the brake pressure regulator is adjusted
to make front wheels lock first, while preventing rears from locking. Is
it set up differenly on rally cars or do the drivers use some technique
to make the rears lock first? What's the purpose of doing this?

Aleksander Mierzwa
Warsaw, Poland
mailto:alex@matrix.com.pl
87 Audi 5000CS turbo (mine)
88 Renault Medallion wagon (mom's)
91 mountain bike (just in case both cars broke at the same time :-)