Vehicle braking system

A vehicle braking system comprising:

• a master cylinder having a first master cylinder chamber and a second master cylinder chamber and a pedal feel simulator incorporated therein;
• a reservoir configured to retain a volume of unpressurized brake fluid for use in the vehicle braking system;
• a first wheel cylinder coupled to the first master cylinder chamber via a first braking circuit;
• a second wheel cylinder coupled to the second master cylinder chamber via a second braking circuit;
• an electronically-controlled pressure generating unit configured to move fluid through the first braking circuit and the second braking circuit to the first and second wheel cylinders in a first mode of operation;
• a first two-way valve positioned in the first braking circuit and configured to selectively decouple the master cylinder from the first wheel cylinder;
• and
• a second two-way valve positioned in the second braking circuit and configured to selectively decouple the master cylinder from the second wheel cylinder,
• wherein, in the first mode of operation, the first and second two-way valves decouple the first and second master cylinder chambers from the first and second wheel cylinders, respectively, and couple the first and second master cylinder chambers to the reservoir, and
• wherein, in a second mode of operation, the first and second two-way valves couple the first and second master cylinder chambers to the first and second wheel cylinders, respectively;
• further comprising a motor-driven pump separate from the electronically-controlled pressure generating unit and configured to move fluid through the first braking circuit to the wheel cylinder in a third mode of operation.

A vehicle braking system comprising:

• a brake pedal coupled to an input rod;
• a pedal feel simulator having a piston coupled directly to the input rod and configured to provide feedback to an operator of the brake pedal;
• a reservoir configured to retain a volume of unpressurized brake fluid for use in the vehicle braking system;
• a wheel cylinder coupled to the pedal feel cylinder via a first braking circuit;
• a switching valve located within the first braking circuit, wherein, in a first position, the switching valve couples the pedal feel simulator to the reservoir such that an atmospheric loop is established between the pedal feel simulator and the reservoir, and in a second position, the switching valve couples the pedal feel simulator to the wheel cylinder;
• and
• an electronically-controlled pressure generating unit configured to move fluid through the first braking circuit to the wheel cylinder in a first mode of operation,
• wherein, in the first mode of operation, the switching valve is in the first position, and
• wherein, in a second mode of operation in which the electronically-controlled pressure generating unit is inoperable to move fluid through the first braking circuit, the switching valve is in a second position.