A hydraulic unit comprises a solenoid valve group with at least two solenoid valves having each a valve cartridge and a solenoid subassembly arranged around the valve cartridge. According to the invention, a positioning unit is arranged between at least two adjacent solenoid valves and applies a force to at least two adjacent solenoid valves in such a way that the corresponding solenoid subassembly of the solenoid valve takes a defined radial position relative to the corresponding valve cartridge of the solenoid valve.