Fault-tolerant brake system

A brake system, comprising:

• a tandem power transmission unit selectively driven by a first electric motor to provide pressurized hydraulic fluid to primary and secondary output lines;
• a plurality of wheel brakes;
• a plurality of iso/dump control valve arrangements, each iso/dump control valve arrangement being associated with a selected wheel brake of the plurality of wheel brakes and selectively providing slip control to the selected wheel brake;
• a first traction control iso valve hydraulically interposed between the tandem power transmission unit and at least a selected iso/dump control valve arrangement via the primary output line;
• a second traction control iso valve hydraulically interposed between the tandem power transmission unit and at least an other iso/dump control valve arrangement via the secondary output line;
• a DAP power transmission unit associated with at least one wheel brake of the plurality of wheel brakes, the DAP power transmission unit 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 tandem power transmission unit, the DAP power transmission unit, and each of the iso/dump control valve arrangements;
• and
• an electronic control unit operative to control at least one of the first and second electric motors.