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This site has step by step instructions (with photos), perhaps the A4 is similar. http://audidiy.blogspot.com/2010/04/how-to-replace-brake-light-bulb-on-audi.html
This document by Shailesh Govekar explains in detail how to change a brake light bulb on a Audi TT Coupe 2005. http://www.interactioncenter.co.uk/Audi_TT_Coupe_2005.pdf Regards
Id leave it in to a qualified mechanic - brakes are not to be messed with!
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.
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.
Replace the brake pads.
Audi brake switch same as VW Golf (in newer models). A common problem with VW Golf 2002 is the brake light switch. The vehicle won't come out of park if it breaks. The 2002 model had a recall due to faulty brake switches. Read online how to fit it before fitting - easy to break if you don't understand what you're doing.
You should have a Brake Wear Sensor that will give you the light on your dash when it's time to change brake pads.
Faulty ABS unit .
Pull the carpeting behind the brake light. Unclip the assembly, replace bulb.
A bad brake sensor can cause the ESP light to stay on in an Audi. Other reasons the light stays on include a problem with the batter, loose clamp causing a leak in the intake, and worn brake pads.
I don't know but that is a sweet ride