Abstract: A brake device has a housing in two parts releasably connected together by bolts. Co-operating pressure fluid passages in the two housing parts communicate pressure fluid from a source to actuators within the housing, and include separable plug and socket connectors located on the respective housing parts so that separation of the housing parts effects disconnection of the actuators from the pressure fluid source. A non-return valve is arranged to close on separation of the housing parts and to be opened again by the plug connector. An electrical connection to an electrically powered cooling fan can be similarly broken when the housing parts are separated.

Abstract: A brake performance monitor has a first sensor 12 for detecting movement of a brake device to apply the brake, and a second sensor 14 for detecting a predetermined force necessary to apply the brake in normal operating conditions. If the braking force deteriorates, the brake movement is detected before the predetermined force is reached, and an output device 10 signals the fault, for example by halting the machinery 4 being braked.

Abstract: A brake device includes actuators (31) for brake pads (30), which can be pneumatically powered to which urge the brake pads (30) into engagement with a brake disc (20). The actuators (31) are mounted on a front housing portion (2) which is pivotable on a rear housing portion (4) to open the housing and allow access to the actuators (31), as for servicing. Opening the housing causes a normally closed orifice (49) in the compressed air supply line to be opened, relieving pressure on the actuators (31), and protecting them from damage.