Patent ID: 6953228

Claim:
An actuating device for a brake unit of an electronically controlled vehicle brake system, the actuating device comprising a tappet constructed and arranged (i) for positioning in axially displaceable relationship in a housing of the brake unit of the electronically controlled brake system of a vehicle, (ii) for actuating a piston to operate a brake valve of said brake unit, and (iii) for mechanical connection to a brake pedal of said vehicle, said tappet including at an end facing said piston a base plate, a guide ring guided in said housing against rotational movement, said guide ring including a receiving portion for holding said base plate against rotational movement and including spaced-apart holes, a displacement sensor slide movable with said tappet for measuring axial movement of said tappet, a spacer ring disposed in said guide ring for providing a preselected amount of lost motion, said spacer ring including angled edges extending therefrom into said spaced-apart holes, a window protruding radially outwardly from said guide ring into a guide slit defined in said housing for receiving an end of said displacement sensor slide.