The braking elements comprise at least an elastic washer for providing {HEAD ~ axially prestressed mutual contact} of {TAIL ~ the friction surfaces} of the discs 
The braking elements comprise at least an elastic washer for providing { HEAD ~ axially prestressed mutual contact } of { TAIL ~ the friction surfaces } of the discs
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH