Luk LMC649 Clutch Master Cylinder

Clutch Master Cylinder for Manual Transmission Service

The LuK LMC649 clutch master cylinder is a new hydraulic replacement for manual transmission systems on select Chevrolet Silverado 2500 HD, Silverado 3500, GMC Sierra 2500 HD, and Sierra 3500 trucks. It is built for vehicles that use a hydraulic clutch release setup and includes the push rod and installation instructions for a straightforward service job.

Key Features

• New clutch master cylinder for manual transmission components
• Includes push rod
• Installation instructions included
• Not pre-filled and not pre-bled
• Supplied without clutch slave cylinder
• Direct replacement part number: LMC649

Product Details

LuK has extensive experience in hydraulic clutch release systems, and this clutch master cylinder reflects that background with a service replacement built for consistent pedal-to-hydraulic transfer. The LMC649 is a new part for 2001-2006 Chevrolet Silverado 2500 HD and Silverado 3500, as well as 2001-2006 GMC Sierra 2500 HD and Sierra 3500 applications. This part cross-references Dorman - First Stop CM640037 and Dayco 72649 for the same application.

Common Issues This Part Can Address

• Soft or inconsistent clutch pedal feel caused by master cylinder wear
• Hydraulic fluid leakage at the clutch master cylinder
• Difficulty disengaging the clutch during shifting
• Loss of hydraulic pressure in the clutch release system
• Clutch pedal travel problems related to internal seal failure

Installation Notes and Tips

Fits 2001-2006 Chevrolet Silverado 2500 HD, N/A; fits 2001-2006 Chevrolet Silverado 3500, N/A; fits 2001-2006 GMC Sierra 2500 HD, N/A; and fits 2001-2006 GMC Sierra 3500, N/A. Verify hydraulic line condition, inspect the clutch slave cylinder before installation, and follow the included instructions during replacement. Because the unit is not pre-filled or pre-bled, the hydraulic system will need to be filled and bled after installation. The push rod is included; heat shield is not included.

Quality Assurance

LuK, part of Schaeffler, brings long-standing expertise in complete clutch release systems and hydraulic clutch technology. The LMC649 is a new replacement component built for manual transmission service on the listed Chevrolet and GMC truck applications.