It is recommended to check the fluid level in the expansion tank once every 4 weeks.
If the fluid level becomes low, add brake fluid meeting SAE J 1703, DOT 3, or DOT 4 specification.
The fluid level in the expansion tank should be between the MIN and MAX marks. If the level has dropped below the MIN mark, the hydraulic clutch should be inspected for leaks. Replace the relevant parts if necessary. If the system is leaky, the clutch slave disk is worn.
The article is based on data from the website: MitsubishiMan.ru