Brake-by-wire system with piston pry-back prevention

A vehicle Brake-By-Wire (BBW) system comprising:

• a brake rotor;
• a caliper adapted to exert a hydraulic force upon the brake rotor during a braking action;
• a master cylinder including a housing defining a piston cavity, a piston, an actuator adapted to controllably move the piston within the piston cavity, a compensation opening defined by the housing and in fluid communication with the piston cavity, and a fluid opening defined by the housing and in fluid communication between the caliper and the piston cavity, wherein the piston is constructed and arranged to close the compensation opening to prevent hydraulic fluid flowback and open the compensation opening to relieve fluid pressure;
• a controller;
• a pry-back prevention module stored and executed by the controller, the pry-back prevention module is configured to receive a vehicle condition signal indicative of a deflected rotor condition and output a command signal to the actuator causing the piston to close-off the compensation opening to prevent flowback of hydraulic fluid from the caliper and to the master cylinder;
• and
• a pressure sensor constructed and arranged to measure hydraulic fluid pressure, and configured to send a hydraulic fluid pressure signal to the pry-back prevention module, wherein the pry-back prevention module is configured to determine if the hydraulic fluid pressure exceeds a preprogrammed threshold pressure during the deflected rotor condition, and upon exceeding the preprogrammed threshold pressure, output a second command signal to the actuator causing the piston to open the compensation opening.