For the ones still interested
I've found a garage ( the 4th) that was able to do the simple job.
It was indeed like i thought en like suggested here, air in the system..a simple 10 min job, and it was great breaking again.
This shop looked like they know what to do unlike some others. They do all the work on cars , up to complete engine revisions....so this is the one i'll keep trying.
Owner is there all day and knows his work.
It's called Duckhams....next to Taweekit supercentre on the right side ( just over the track next to an insurance office) There is no clear sign on it and it looks a bit roughed up, but they have all the equipment to do all the work and a lot better mechanics...
Finally......
thanks for the input everybody