Patent ID: 8393688

Claim:
Three-way valve simulator ( 100 - 400 ) for a vehicle brake servo, comprising: a control piston ( 106 - 406 ); and a reaction piston ( 140 - 440 ) remote from the control piston when the simulator is at rest, characterized in that the simulator is arranged such that the control piston, under the effect of a command transmitted from outside the simulator, is movable over a predetermined travel in the direction of the reaction piston without transmitting stress to the reaction piston, and in that the simulator is arranged such that, after movement over the predetermined travel in the direction of the reaction piston, the control piston ( 106 - 406 ) abuts the reaction piston ( 140 - 440 ) to thereafter directly transmit a stress to the reaction piston ( 140 - 440 ).