Brake system apparatuses, methods, and arrangements

A brake system for actuating a plurality of wheel brakes in a normal non-failure braking mode and in a backup braking mode, the brake system comprising:

• an MC-type power transmission unit having a first electric motor for at least partially pressurizing hydraulic fluid;
• first and second output lines for routing the pressurized hydraulic fluid from the MC-type power transmission unit;
• an iso/dump control valve arrangement associated with each wheel brake of the plurality of wheel brakes;
• a first traction control iso valve hydraulically interposed between the MC-type power transmission unit and at least one iso/dump control valve arrangement via the first output line;
• a second traction control iso valve hydraulically interposed between the MC-type power transmission unit and at least one iso/dump control valve arrangement via the second output line;
• a pump piston associated with at least one wheel brake of the plurality of wheel brakes, the pump piston being driven by a second electric motor for selectively providing pressurized hydraulic fluid to the iso/dump control valve arrangement of the at least one associated wheel brake;
• a reservoir hydraulically connected to the MC-type power transmission unit and each of the iso/dump control valve arrangements;
• at least one electric brake motor, each electric brake motor being operative to selectively drive a selected wheel brake;
• a first electronic control unit operative to selectively control the electric motor of the MC-type power transmission unit;
• a second electronic control unit operative to selectively control the second electric motor, at least one of the iso/dump control valve arrangements, and at least one of the first and second traction control iso valves;
• and
• a third electronic control unit operative to control the at least one electric brake motor.