Brake system for autonomous operation

A method for autonomous braking, the method comprising:

• determining an operating condition of at least one brake of a vehicle to be in a normal braking condition or a failure braking condition;
• controlling a primary valve set having a primary control valve in series with a primary enable valve to apply braking force to the at least one brake in response to a determination of the normal braking condition;
• controlling a secondary valve set having a secondary control valve in series with a secondary enable valve to apply braking force to the at least one brake in response to a determination of the failure braking condition;
• and
• controlling application of braking force to the at least one brake via the primary valve set or secondary valve set with a first shuttle valve positioned between the at least one brake and the primary valve set and the secondary valve set.

A vehicle for ground working operation in a field, the vehicle comprising:

• a plurality of wheels;
• a chassis supported on the plurality of wheels and configured for moveable operation, the chassis configured with attachment points for movable coupling to a work tool;
• and
• a brake system configured to apply brakes to one of slow or stop rotation of the plurality of wheels, the brake system comprising:
• at least one brake;
• a main pump;
• a backup energy source;
• a primary valve set having a primary control valve in series with a primary enable valve;
• a secondary valve set having a secondary control valve in series with a secondary enable valve;
• a first shuttle valve in fluid communication with the primary valve set, the secondary valve set, and the at least one brake, wherein the first shuttle valve is positioned between the at least one brake and the primary valve set and the secondary valve set,
• wherein the at least one brake, the main pump, the backup energy source, the primary valve set, and the secondary valve set are in fluid communication;
• and
• a control unit configured to control operation of the main pump, the backup energy source, the primary valve set, and the secondary valve set in response to one of a normal braking condition or a failure braking condition.