A patient support apparatus comprising: a caster (33, 33', 35, 35') including a stem (160, 160'), a wheel (164, 164') coupled to the stem (160, 160') to rotate about an wheel axis relative to the stem (160, 160'), and a braking element (170, 170') movable from a disengaged position allowing rotation of the wheel (164, 164') relative to the stem (160, 160') to an engaged position blocking the wheel (164, 164') from rotation relative to the stem (160, 160'), a brake drive (150, 150') including a mount (154, 154') and a linear actuator (156, 156') coupled to the mount (154, 154'), the linear actuator (156, 156') to move from a retracted position to an extended position relative to the mount (154, 154'), and a linkage (152, 152') coupled to the braking element (170, 170') of the caster (33, 33', 35, 35') and to the linear actuator (156, 156') of the brake drive (150, 150'), the linkage (152, 152') configured to transfer motion of the linear actuator (156, 156') from the retracted position to the extended position to the braking element (170, 170') to move the braking element (170, 170') from the disengaged position to the engaged position, the linkage (152, 152') further configured to selectively move the braking element (170, 170') from the engaged position to the disengaged position while the linear actuator (156, 156') is in the extended position so that a user can free the wheel (164, 164') of the caster (33, 33', 35, 35') to rotate even if the actuator (156, 156') is stuck in the extended position, characterised in that the linkage (152, 152') includes a shaft (194, 194') coupled to the mount (154, 154') to slide relative to the mount (154, 154') and a release assembly (172, 172') coupled to the linear actuator (156, 156'), the release assembly (172, 172') configured to couple the shaft (194, 194') to the linear actuator (156, 156') so that the shaft (194, 194') slides relative to the mount (154, 154') during movement of the linear actuator (156, 156') from the retracted position to the extended position and to selectively release the shaft (194, 194') from the linear actuator (156, 156') when the linear actuator (156, 156') is in the extended position. a caster (33, 33', 35, 35') including a stem (160, 160'), a wheel (164, 164') coupled to the stem (160, 160') to rotate about an wheel axis relative to the stem (160, 160'), and a braking element (170, 170') movable from a disengaged position allowing rotation of the wheel (164, 164') relative to the stem (160, 160') to an engaged position blocking the wheel (164, 164') from rotation relative to the stem (160, 160'), a brake drive (150, 150') including a mount (154, 154') and a linear actuator (156, 156') coupled to the mount (154, 154'), the linear actuator (156, 156') to move from a retracted position to an extended position relative to the mount (154, 154'), and a linkage (152, 152') coupled to the braking element (170, 170') of the caster (33, 33', 35, 35') and to the linear actuator (156, 156') of the brake drive (150, 150'), the linkage (152, 152') configured to transfer motion of the linear actuator (156, 156') from the retracted position to the extended position to the braking element (170, 170') to move the braking element (170, 170') from the disengaged position to the engaged position, the linkage (152, 152') further configured to selectively move the braking element (170, 170') from the engaged position to the disengaged position while the linear actuator (156, 156') is in the extended position so that a user can free the wheel (164, 164') of the caster (33, 33', 35, 35') to rotate even if the actuator (156, 156') is stuck in the extended position,