FIELD: transport engineering; brake systems. SUBSTANCE: radial inner restriction and radial outer restriction in pressure leveling chamber limited by valve body in steering mechanism case is provided by part directing the valve body. Thanks to it dynamic component of force acting onto valve body depending on pressure in brake system vacuum booster is reduced to minimum without introduction of changes into design of steering mechanism with control valve. EFFECT: enhanced reliability in operation. 8 cl, 2 dwg
