Vehicle inspection passed!
It took some work thought. A couple of days work of finding the right parts and installing them. Luckily there was Markku who helped and lent his garage. Thank you.
We changed the front brake calipers and hoses. Also used some sandpaper on the rear brake drums. Some adjusting, greasing and bleeding with the result that now the brakes work perfectly, no sticking, no squealing.
There is still some work to do with the bus but at least now I get to drive it legally!