BRAKE SYSTEM

A vehicle includes a chassis, multiple tractive elements coupled with the chassis, and a brake system. The brake system includes a caliper body that defines a sealed inner volume, a piston, a spring, a valve, brake pads, a movable member, and a position sensor. The piston is positioned within the sealed inner volume and divides the sealed inner volume into a first sub-volume and a second sub-volume. The spring is within the first sub-volume and biases the piston to extend. The valve fluidly couples the second sub-volume with a pump. The brake pads are configured to be driven by the piston to engage a brake rotor. The movable member is coupled with the piston and is configured to translate with translation of the piston. The position sensor is operably coupled with the movable member and configured to generate a signal responsive to translation of the piston and the movable member.