Brozee

Finally I took my A8 to a shop to be looked at. The error I was getting was a random ESP Fault that would turn off my cruise control, traction control and along with an annoying beep. So i took it to a European car shop and had it looked at, and only problem seemed to be the brake light switch. Still have the original battery in the car, which was reading low voltage so had that replaced as well. Just in case anyone else comes across this problem here's your fix
The brake light switch was only $22, and the battery was an unfortunate $190 a nice interstate battery though . $39 installed and coded.
Cheers!

tjsa8

Just had our brake light switch replaced as well. It was a $14 part with $100 of labor. Sheesh. It was responsible for an ABS warning light and a parking brake warning light - and the annoying beeping. The dealer very specifically told us that when that brake light switch goes, it confuses alot of other modules, like the ones that run the ESP, ABS and such.

Ringmeister

I had a similar problem, multiple ESP faults... turned out to be a brake light switch.

Brozee

yeah isn't it crazy! I was like oh okay, only $20 no problem! Then the total was like $126 after labor and diagnostic.

Mister Bally

You still got off light. Dealer repair invoices on A8's are rarely under $500.00 But most give you a "free" car wash with the sandpaper brush wash-o-matic.

Brozee

I still don't consider this getting off light. The dealer is a joke and I never go to them because of their outrageous prices. Hell they even charge you to top your liquids. I can top my own washer fluid lol! I demanded they remove this ridiculous charge and I also told them I wouldn't pay a penny over $200 for an oil change. I got my way and that was the last time I went to the stealer.

Bunky

I'm having the same ESP/parking brake/beeping problem and after reading this I'll bet it's the brake light switch. From the Bentley manual, looks like it might not be that hard of a do it yourself fix -- anyone try it? If so, do you know the part number of the switch?

Bunky

I'm having the same ESP/parking brake/beeping problem and after reading this I'll bet it's the brake light switch. From the Bentley manual, looks like it might not be that hard of a do it yourself fix -- anyone try it? If so, do you know the part number of the switch?

Samo7

Not sure I understand you when you say it was the brake light switch. I have the same problem as you. How did they know the problem? Through the vag-com?

Mister Bally

Yes, VAG scan. Also, the experience of several posters here who have mentioned the repair to this very common problem.