A hydraulic connector for a wiper system includes an end part of an arm extending in a longitudinal direction, a blade, a mechanical connector fixed to the blade for attaching the blade to the arm, and at least one pipe for conveying a liquid to the blade via the mechanical connector and at least one button intended to connect the hydraulic connector to the end part in a standby position. The button is retractable so as to allow movement of the hydraulic connector with respect to the end part.