We fixed the car!!!!
I'll be there, 100% sure now!!!
Don't know exactly what the problem with the brakes was. First, we pumped some brake fluid out of the front right calliper. Then I did a test, and the car didn't pull to the left that much anymore, only a very slight bit (tested it by braking quite hard from 140 -> 80 with no hands on the steering wheel).
The brake fluid was almost black... (brake fluid was last changed a little more than 1 year ago) I got a bottle of brake fluid, and flushed the system.
I called Ring Racing, and they were 90% sure they had front race pads for the M5 on stock. They didn't have time to check it, because they were too busy with a VLN race. Anyway, 90% is enough.
So, tomorrow morning, 8 AM, I leave in Belgium. Should arrive around 10 AM in Nurburg. Straight to Ring Racing for the pads, install them, 11 AM at the Ring!
Got a spare set of rear pads in the trunk, the rears are only halfway, but you never know. I don't think the extra weight of these pads will slow me down too much
Thanks for the kind words guys! Much appreciated.
About the 3k... Well, radiator, brake disks front and rear (installed myself), inspection II, new shifter (545 shortshifter

), new shoft knob, new handbrake handle, replaced 1 PDC sensor, replaced a part for the interior circulation. That's about it...
I mailed BMW Belgium that I think it is inacceptable that I get a 3K repair bill, and still have to fix the car myself to be able to go to the Ring. I've had a bunch of other problems with this dealer, and I'll never go there again. Waiting for the response of BMW Belgium before I pay the bill...
See you tomorrow guys!