I have a B4 2001 and from reading other posts, the procedure should be about the same. Pry off the small circular cover from inside the boot in the general vicinity of the top of the light assembly. Mine was about the size of the fifty cent piece. There is a bolt/screw underneath this cover. Remove it, taking GREAT care not to drop it behind the boot fascia. Once it's removed, you should be able to wiggle the entire light assembly from the outside. My model assembly was held on by the single bolt/screw and two 'plastic plugs' that fitted onto the front-most part of the assembly. These two 'plugs' simply pull out of the car frame (not screwed in) and come straight out with some gentle wiggling of the assembly. The light bulb 'frame' for the bulbs clips into the assembly and is easily removed.
Replace the brake pads.
Pull the carpeting behind the brake light. Unclip the assembly, replace bulb.
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.
To change the brake light on an Audi A3, first, open the trunk and locate the rear light assembly. Remove the cover or access panel to reach the brake light bulb. Twist the bulb holder counterclockwise to remove it, then pull out the old bulb and replace it with a new one, ensuring it is securely seated. Finally, reassemble the light assembly and test the brake light to ensure it’s functioning correctly.
To replace the brake light bulb on an Audi A3, first, open the trunk and locate the tail light assembly. Remove the appropriate access panel or cover, then twist the bulb socket counterclockwise to release it. Pull out the old bulb and insert the new one, ensuring it's securely in place, then reassemble the socket and cover. Finally, test the brake light to ensure it's functioning properly.
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
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.
To replace the brake light bulb on a 2005 Audi A6, first, open the trunk and locate the rear light assembly. Remove the access cover or screws securing the light assembly, then gently pull it out. Twist the bulb holder counterclockwise to release it, replace the old bulb with a new one, and reassemble by reversing the steps. Ensure the assembly is securely in place and test the new bulb before closing the trunk.
To change the center brake light on a 2007 Audi A4 Quattro, start by opening the trunk and removing the plastic cover or trim panel that conceals the brake light assembly. Next, locate the brake light bulb holder, twist it counterclockwise to release it, and remove the old bulb. Replace it with a new bulb, reassemble the holder, and snap the cover or trim panel back into place. Finally, test the brake light to ensure it’s functioning correctly.
You need to replace the break pads or you can bodge it up by connecting the two wires
By going to the nearest service!
My brake job on my A4- rotors and pads- $473.