Luk LMC646 Clutch Master Cylinder

Clutch Master Cylinder for Subaru Impreza

Restore hydraulic clutch release performance with this LuK clutch master cylinder, part number LMC646. It is a new replacement unit for manual transmission service and includes the push rod and installation instructions for a more straightforward repair on Subaru Impreza applications.

Compatible with 2008-2013 Subaru Impreza applications, this clutch master cylinder is built for vehicles that use a hydraulic clutch release system. LuK’s experience in clutch release systems supports a precise OE-style replacement for common clutch pedal and hydraulic concerns.

Key Features

• Brand: LuK
• Part number: LMC646
• Clutch master cylinder for manual transmission components
• New part
• Push rod included
• Installation instructions included
• Pre-filled fluid: No
• Pre-bled system: No
• Heat shield included: No
• Supplied without clutch slave cylinder

Detailed Description

The LuK LMC646 clutch master cylinder is a direct-fit hydraulic component for Subaru Impreza manual transmission service. LuK has extensive background in the development of hydraulic clutch release systems, and this replacement cylinder reflects that focus with a design intended for dependable clutch pedal hydraulic operation. Use this part when servicing a worn or leaking master cylinder on 2008-2013 Subaru Impreza models, including 2012 Subaru Impreza built to 03/01/2012 and 2013 Subaru Impreza built to 12/31/2012.

This part cross-references Sachs SH5531 for the same application.

What It Helps Fix

• Soft or inconsistent clutch pedal feel
• Hydraulic fluid leakage at the master cylinder
• Difficulty disengaging the clutch
• Pedal travel issues caused by internal cylinder wear
• Loss of hydraulic pressure in the clutch release system

Installation Notes and Tips

• Bleed the hydraulic system after installation because the unit is not pre-bled.
• Fill with the correct clutch hydraulic fluid before service.
• Inspect the clutch slave cylinder, hydraulic line, and pedal linkage during replacement.
• Use the included installation instructions for vehicle-specific guidance.
• Verify fitment by model year and build date for 2012 and 2013 Subaru Impreza applications.

Quality Assurance

LuK is part of Schaeffler’s clutch release system expertise, with a long history in hydraulic clutch technology. The LMC646 is a new replacement part built for manual transmission service on Subaru Impreza applications.