Abstract: A member placed in a vehicle driving simulator makes it possible to simulate the hydraulic braking and driving controls. It comprises a cylindrical envelope in which slide a first member and a piston joined by a tubular elastomer spring, whose compression simulates the deformation of the hydraulic pipes and the braking members. With the bottom of the envelope, the piston forms a back-pressure chamber which is supplied with compressed air and makes it possible to simulate the feedback of the braking system. A retractable stop at the bottom of the envelope and on which bears a rod extending the piston, makes it possible when it is retracted, to simulate a hydraulic circuit failure.