VW Touareg 2012, Parking brake motor

Hello. It's aTouareg 2012 with a parking brake problem. The car ran a lot with no functional parking brake and my brother (the owner) decided to repair it. We've replaced the brake disks, parking brake pads and the parking brake motors - oem.
The service manual explains that the airgap needs to be adjusted between 1.9 mm and 2.4 mm and no more than 0.2 mm between left and right. The left wheel went ok but on the right not so easy. Every time I try to adjust the airgap I cannot adjust it in that range, it is always above. Also, there is a DTC - "Right parking brake motor mechanical malfunction" every time I activate the airgap adjustment function. Managed to hookup an 2000 series 2 channel scope to both motors, and I've merged in one file with Picoscope 6 software. My thought was that is a bad relay in the parking brake module but I don't think this anymore. Any thoughts?
Tank you!

Link to psdata on my Google drive:  drive.google.com/drive/folders/1msxzsdCX...P49mp5jNTEl-3IIMlrTP

Hi,

I have found your post while looking for information on a Touareg we are having EPB problems with. We are having exactly the same issue as you, we cannot get right rear to adjust within range and have a mechanical malfunction fault even with brand new genuine actuator.

Did you ever resolve this issue, and if so would you be able to give me some information on the solution?

Thank you!