the heads of the bolts to rotate into lock and unlock during forward dwell the housing is supported by a pair of recoil adapters 24 to the gun mount as shown for example in u s pat no 4 345 504 issued to r g kirkpatrick et al on aug 24 1982 which permit longitudinal movement of the housing in response to recoil forces a brake assembly 50 is fixed to the aft end of the housing and is coupled to the rotor assembly the brake assembly 50 includes a brake housing 52 which is fixed to the gun housing 10 by suitable means such as bolts a brake cover 54 is fixed to the housing 52 by suitable means such as threads a brake shaft 56 is journaled for rotation by a forward bearing 58 captured between opposed shoulders in the housing 52 and the shaft and by an aft bearing 60 captured between opposed shoulders in the cover 54 and the shaft a plurality of interleaved stator disks 62 and rotor disks 64 are disposed on the shaft within the housing 52 the stator disks are keyed onto splines 66 in the housing and the rotor disks are keyed onto splines 68 in the shaft the disks are held closely together by a bellows 70 filled with a fluid such as.