The braking means comprises a plurality of {HEAD ~ disks} kept in {TAIL ~ frictional contact} by at least one axially elastic element 
The braking means comprises a plurality of { HEAD ~ disks } kept in { TAIL ~ frictional contact } by at least one axially elastic element
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH