Abstract: A liquid-cooled heavy duty brake assembly including a number of rotor discs for cooperation with stator discs for braking an external rotating body connected to the rotor discs which is to be selectively braked. The rotors and stators are normally biased apart, but are movable toward each other along the direction of the axis of rotation of the rotor discs in order to effect braking. The casing for the assembly is closed and includes heat exchanging portions around the periphery thereof, including fins extending inwardly toward the axis of rotation of the rotor discs, and the casing is filled to less than capacity with cooling liquid.

Abstract: A heavy-duty disc brake assembly and pneumatic actuating assembly therefor. The pneumatic actuating assembly may include a pair of annular pistons operatively connected for simultaneous movement thereof, apparatus being provided for supplying air under pressure to the working faces thereof, or a single piston spring biased to braking position with apparatus for supplying air under pressure to either face thereof. The disc brake assembly includes a plurality of relatively movable rotor and stator discs, and preferably a closed cooling system with circulatory loop is provided.