Replace the brake pads.
Don't ignore the light. It's telling you to have the brakes inspected.
The brake light in the Audi A4 display means there is an issue with the brake system. The most common cause of this warning light is low brake fluid.
Faulty ABS unit .
My 99 Audi Quatro 4.2 A6 Avant has a recurring appearance of the ABS light & Brake Warning light. Any Suggestions?
Warning light symbols with explanations for 2003 Audi a4
Audi has a greedy touch by scaring audi owners that their brakes are bad... It's BS
You need to replace the break pads or you can bodge it up by connecting the two wires
As of 2014, the cost for a Audi A4 brake light is between 12 and 15 dollars. This light can be purchased at stores like Auto Zone.
It will say BRAKE on USA cars depending on the year. Or, it will flash an icon of a brake drum.
In the A4 it's not a warning light, it should actually indicate that your lights are on.
Pull the carpeting behind the brake light. Unclip the assembly, replace bulb.
You need to take your car into a service center to get the warning light turned off. The light is on because there is a problem about system.