I have a Bobcat ZX231 942241A. The mower will start with the brake tuned on but the engine shuts down when I remove the brake. I have had this used mower for two summers. I have cleaned on the connections in the wiring harness but no luck. I check the drive leavers with the brake on and they will kill the engine if engaged. I have checked the PTO with brake on and it too kills the motor. Engine will not turn over if brake is turned off also. john