Xtool VAG401 is able to put the electronic rear parking brake into service mode on Audi /VW
Purpose: Replace parking brake (EPB)
Car model: 2010 Audi A5
The tool used: Xtool V401
Symptom: Brake Pad Indicator Light Comes On
What I Did to Do:
Putting the electronic rear parking brake into service mode using an Xtool V-A-G401. Total time from start to finish was about 1 hour which includes jacking the car up and removing the rear wheels.
Connect a battery charger to the car. Turn the ignition on but don’t start the car. Plug the Xtool into the OBDII slot and select Diagnose
Select Special Function
Scroll down until you see Brake Pad Replacement. Select Brake Pad Replacement.
I have a 2010 Audi A5 so I selected Other Models.
Select Replacement of Brake Pads
At this point you want to press the parking brake button down to release the rear brakes. Then press enter.
You will start to hear the electronic parking brake motor start to back out.
The light on the parking brake button will slowly flash, and the “brake” light on the cluster will slowly flash as well. Now you’re ready to replace your brake pads!
I wedged a flathead screw driver in between the brake piston and the old brake pad and leveraged the piston back into the caliper.
I used a 13mm socket for the back bolt, and a 15mm box wrench to hold the nut down.
Replace the old brake pads with the new ones.
Reverse the steps that you took to remove the pads and reinstall the caliper. Check everything and put the wheels back on.
Now go back to the Xtool. The screen is still displaying the old message of replacing the rear the pads for the two rear wheels. Just hit enter on the Xtool. The electronic brake is moving back into position.
When the electronic brake stops, the Xtool will say “Replace brake pad success”. The brakes are still not applied. The motorized piston just pushes back out until it reaches the new pads.
I turned the ignition off, then back on/started the car. I exited all menus on the Xtool, then I lifted the parking brake button to activate the electronic rear parking brake. Success!
Credit to Gamble52 from Audizine