Yellow Warning says Brake Light. on 2000 Audi A6 Quattro

When I put my foot on the brake to put the car in drive or gear this light beeps and comes on and stays on. Is this a bulb, switch or wiring problem? How do I test for these conditionss? Thank You.

1 answer
The easiest way to see if it is a brake light out is to have some one stand behind the vehicle while you depress the brake pedal.