I cleaned the calipers with high pressure air:
and after I began assembling them:
... new inner seal....
... and then I stucked in the piston ....
(fist time in the wrong position: my first mistake 8) )
and because I didn't stuck them to the end, I thought the new seals weren't good to use....
(my second mistake :mrgreen: )
... and so at first, I didn't understand why there was this spring in the new reapir kit: