How do you change the brake light switch on a Audi A4 and were it is located at?

Answer 1

Here is the install procedure you should use and this applies to all new switches they have a purple housing:

1) Remove the bottom panel underneath your dashboard (if needed)

2) Push brake pedal down

3) Remove sensor electrical clip

4) Remove brake light switch by turning it 45 degrees to the left and pulling it out

5) Let go of brake pedal

6) Prep the sensor: make sure the plunger is pulled out fully (extended OUT) *warning* Make sure you do not push the plunger in at any time.

7) Here's the new step: Do not depress pedal as far as you can. Leave the pedal in it's normal position and push the brake light switch into the mounting hole.

8) You will hear several "clicks" which is essentially setting up the length of your plunger to the pedal. Turn the brake switch 45 degrees to the right to enable the "setting" for your brake. There is a tiny rotating part that activates the setting on your switch when you rotate it.

9) This is ONE time deal so if you mess up do not pull the plunger out to try again.

10) Install the electrical plug

11) Check brake lights, the lights should come on with very little brake pedal movement. If you need to depress the brake a lot in order for the lights to come on, you have done the "setting" part incorrectly. There's no fix for this, you'll have to get an exchange for a new part if they'll let you.

Overall this is an easy install but can be annoying because of the one time setting deal.

Hope this helps!