Brake systems with master cylinders and single corner actuators

A brake system for actuating a plurality of wheel brakes comprising at least first and second wheel brakes, the brake system comprising:

• a reservoir;
• a master cylinder in fluid communication with the reservoir and operable during backup braking mode to generate pressurized hydraulic fluid at first and second MC outputs for hydraulically actuating the first and second wheel brakes, respectively, responsive to user manipulation of a brake pedal mechanically connected to the master cylinder, the master cylinder being a dual chamber type master cylinder;
• a brake simulator in fluid communication with at least a selected one of the first and second MC outputs and with the reservoir for providing predetermined brake pedal response to the user;
• a plurality of single corner actuators, each single corner actuator being hydraulically interposed between a selected one of the first and second MC outputs and a corresponding one of the first and second wheel brakes, each single corner actuator including
• a SCA power transmission unit configured for selectively providing pressurized hydraulic fluid at an SCA output for actuating the respective wheel brake in at least one of a normal non-failure braking mode and a backup braking mode, the SCA power transmission unit including an electric PTU motor configured to selectively pressurize the hydraulic fluid by transmitting rotary motion to a plunger assembly of the SCA power transmission unit;
• at least one two-position three-way valve interposed hydraulically between the plunger assembly and the respective wheel brake for selectively controlling provision of hydraulic fluid to the respective wheel brake from at least one of the plunger assembly and the master cylinder;
• and
• a check valve interposed hydraulically between the respective first or second MC output and the SCA power transmission unit, a cracking pressure of the check valve permitting pressure release from the SCA power transmission unit due to a predetermined amount of thermal expansion;
• and
• an electronic control unit for controlling at least one of the three-way valves and the at least one SCA power transmission unit responsive to at least one brake pressure signal;
• wherein each single corner actuator is indirectly fluidly connected to the reservoir via the master cylinder.