This study investigates the feasibility and performance of a hydraulic regenerative braking system applied to a sport utility vehicle (SUV). A computational model was developed using MATLAB/Simulink, incorporating Simscape Fluids to simulate the dynamic interaction between the vehicle’s longitudinal dynamics and the hydraulic subsystem. The model evaluates system behavior during acceleration and braking events based on Newton’s second law, capturing road load forces, drivetrain characteristics, and hydraulic dynamics. The simulation framework enables the analysis of how key design parameters, such as hydraulic accumulator sizing, pump displacement, and gear reduction—affect the system’s energy recovery potential and dynamic response. The results demonstrate the technical viability of integrating hydraulic energy recovery into passenger vehicles, highlighting the trade-offs between system complexity, component sizing, and performance. This work contributes to the optimization and control of hydraulic hybrid architectures for future energy-efficient passenger vehicle designs.