A door check for vehicle doors, e.g. car doors having a door strap for being mounted to the chassis and a retainer for being mounted to the door movably and supporting the door strap relative to the retainer and provides a particular precise control over the door movement if the retainer has a cylinder supporting a piston which is spring loaded against the door strap and if an actuator is configured to augment the pressure in the cylinder upon demand to thereby augment the friction between the piston and the door strap.