Open your trunk and on the right side and left side there are door flaps one for right for subwoofer i and left side is the car jack .
when u open the door flap there right there on left on both spots just twist and it comes out .
Replace the brake pads.
Pull the carpeting behind the brake light. Unclip the assembly, replace bulb.
to fix the problem in the brake system
depends on the model and year - probably in the boot on the right hand side
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.
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.
You need to replace the break pads or you can bodge it up by connecting the two wires
you go.... and replace it!
By going to the nearest service!
where do you put the tranmission fluid on a 1999 Audi A8
Faulty ABS unit .