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I would strongly recommend you check the brake light switch which works off of the brake pedal.
If you can find it(should be a plunger type switch that works directly off of the brake pedal somewhere,usually in the most awkward position possible!),disconnect the wires from it(should be 2) and short them across together(with a split pin or short length of wire) and the lights should illuminate.Some switches are adjustable,you can push in or pull out the plunger and this can sometimes decide to adjust it's self so the switch doesn't operate properly.
If you short the wires and you still have no lights then it's bulbs(unlikely),wiring or blown fuse.
Sorry if this is obvious but you will need the ignition on to check the brake lights!.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo
Last edited by Lagdti; 23rd February 2006 at 07:12 PM.
Reason: Something added