Overview Similar Products –> Product Description A303 Marathon KIT 3BRK1 Brake Kit for 56/143/145 frames only 3 Torque (LB-FT) 115/208-230 Coil Voltage These kits include a brake mounted to an external cast aluminum fan guard. Designed for easy field installation on Marathon 4-1 motors. 56, 143, and 145 frames only. Please call for availability. Product Videos Custom Field Product Reviews