Hi I have a 2001 S2 Stagea RS4S and I just had a look at the wiring behind the tailgate brake / parker lights and it looks to me like the brake lights has never worked, mine only has a Earth and the Parkers power wire connected, there is a third connection but it has never had a wire crimped in the lug, unless the import completely replace my wiring loom it's never worked
Phill