Electronic brake system

An electronic brake system comprising:

• a first hydraulic circuit associated with a first wheel brake;
• a second hydraulic circuit associated with a second wheel brake;
• a first parking brake associated with a third wheel brake, wherein the third wheel brake is not fluidly coupled to the first and second hydraulic circuits;
• a second parking brake associated with a fourth wheel brake, wherein the fourth wheel brake is not fluidly coupled to the first and second hydraulic circuits;
• first and second controllers,
• wherein the first controller is electrically coupled to the first hydraulic circuit associated with the first wheel brake, and electrically coupled to the second parking brake associated with the fourth wheel brake;
• and
• the second controller is electrically coupled to the second hydraulic circuit associated with the second wheel brake, and electrically coupled to the first parking brake associated with the third wheel brake.

An electronic brake system comprising:

• first and second controllers, the first controller powered from the first power circuitry and the second controller powered from the second power circuitry;
• a first hydraulic circuit associated with a first wheel brake, the first hydraulic circuit electrically coupled to the first controller and powered from the first power circuitry;
• a second hydraulic circuit associated with a second wheel brake, the second hydraulic circuit electrically coupled to the second controller and powered from the second power circuitry;
• a first parking brake associated with a third wheel brake, the first parking brake electrically coupled to the second controller and powered from the second power circuitry, wherein the third wheel brake is not fluidly coupled to the first and second hydraulic circuits;
• and
• a second parking brake associated with a fourth wheel brake, the second parking brake electrically coupled to the first controller and powered from the first power circuitry, wherein the fourth wheel brake is not fluidly coupled to the first and second hydraulic circuits.