I have a 2006 A6 4.2 Quattro with 9000 miles on it.I get a parking brake fault (Parking Brake Malfunction on the dash, and flashing light on the brake switch) whenmy car sits outside in the heat for extended periods of time (I'm talking Atlanta heat, so 95 degrees F is common in the summer). After the first instance, when I was unable to release the brake until the car cooled off, I stopped setting the brake when I have to park outside in the heat. Lately, I am getting the fault whenever I park in the sun, even though I don't set the brake. It gives the (annoying) beep and indicates the parking brake malfunction. I have taken the car in several times, but the dealer has been unable to duplicate the fault. I used a friend's OBD tool to check for codes, but didn't see anything. I don't think his reads all the systems. I am thinking of getting an OBD tool to see what the code is, but am hesitating because the dealer says they are not getting a code and I am not sure if the parking brake sensor is hooked up to the CAN-bus. Any ideas?

 

If there is a hidden code, the dealer should be able to read it.
If you plan on keeping the car past 50K mi. , get a code reader.

http://search.ebay.com/audi-code-rea...Zm37QQfromZR40

 

clearly the car is under warranty because its only 1 year old so dealer job

 

I have the same problem in my 2004 A8L. Its been on five times in 60days I cant say its from the heat im going to the dealer again. I just bought it and im looking into the lemon law to get my money back or a new one.