US Patent 8950378 Retarding system

A machine includes a power source, an engine retarder associated with the power source, and a traction device receiving power from the power source and configured to propel the machine. The machine also includes a brake mechanism associated with the traction device, and a controller in communication with the engine retarder and the brake mechanism. The controller is configured to activate the engine retarder, substantially simultaneously with the brake mechanism, based on a brake pressure associated with the brake mechanism.