Abstract: A method of braking a machine having an electric retarding system and a friction brake system is disclosed. The method includes determining a desired retarding torque based at least in part on an operator input. The method further includes determining a maximum retarding torque of the electric retarding system based at least in part on a maximum grid fan speed. The maximum grid fan speed is predetermined according to a noise requirement of the machine. The method also includes actuating the electric retarding system to supply an output torque based on the desired retarding torque and the maximum retarding torque. The method includes actuating the friction brake system to supply a friction braking torque if the output torque is lesser than the desired retarding torque.