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