Tunnie,
Taking the liberty of dropping in an e-mail I got from a fellow tosser just last week:
"...the other week my bulb warning light came on? I checked, and they all seemed to be working!
Then, the red Brake Failure warning came on, and it stayed on, despite stopping and starting several times.
Yesterday, I got the chance to go to the BMW dealer and report the problem... I was looking forward to them booking it in and replacing the ECU, at a cost of several hundred pounds
It turned out that the brake light filament in the rear bulb had blown. When that happens, the rear light filament glows brighter when the brakes are applied.. a failsafe mechanism. To warn you that this has happened (because, on inspection, everything seems to be working OK), it activates the LAMPR! warning and yellow triangle... and eventually the red Brake Failure warning, because it's a fault in the braking system (bulb).
All it took to fix was a twin-filament rear light bulb. I actually paid them £4.08 for a BMW one, even thought I could have got one from Halfords for £1.99... I was so relieved!
Just so that you know for future... and don't start panicking..."
HTH
Rob
