Hydraulic vehicle brake system

A hydraulic vehicle brake system includes a large hydraulic cylinder (33) with first and second oil chambers (333,335). A movable rod (336) is disposed movably within the cylinder body (331), and is biased to a non-operating position by first and second resilient elements (338,338') when a right brake lever (311) and a controlling element (321) are not actuated. When the controlling element (321) is actuated, hydraulic oil flows from an auxiliary small hydraulic cylinder (322) into a rear brake unit (37) through the second oil chamber (335) so as to brake a rear wheel unit and so as to move the movable rod (336) to an operating position where the hydraulic oil flows from the first oil chamber (333) into a front brake unit (36) through a downstream portion (342) of a first oil conduit unit (34) so as to brake a front wheel unit, after which the first and second resilient elements (338,338') can restore the movable rod (336) to the non-operating position.