320€ + tax doesn't sound common to me
And thats just the brake
It's almost the price of another camera body
That's the 'problem' with MF equipment these days.
'Everybody' * wants a 50 MP Hasselblad digicam, so the film eating thingies are cheap. Used.
Parts (and labour) however are not.
So everytime something needs a repair, it's hard to decide whether to have it indeed looked at, or rather pay less for another, cheaper, used bit, and run the risk that that one may need a repair too (soon).
I just bite the bullet and have things repaired.
* APUG-ers excluded, of course.