Dorman CM126856 Clutch Master Cylinder

Dorman CM126856 Clutch Master Cylinder

Dorman CM126856 is a standard replacement clutch master cylinder for manual transmission applications that require an 18 mm bore. It is precision-engineered to match the original equipment design for specific Chevrolet and GMC trucks and SUVs from 1992-1995, including Chevrolet C1500, GMC K2500, and related models.

Key Features

• 18 mm bore diameter for the specified OE-style application
• Standard replacement grade for direct-fit service
• Designed to match original equipment design for selected vehicle years, makes, and models
• Package contents: clutch master cylinder
• Part number CM126856 for easy identification

Detailed Description

This clutch master cylinder is built for manual transmission systems where the original unit has developed leakage, internal bypass, or inconsistent pedal response. It is a direct replacement for select 1992-1995 Chevrolet and GMC applications, including Chevrolet C1500, Chevrolet K1500, GMC C1500, and GMC Yukon, with fitment notes calling out the 18 mm bore size. The Dorman CM126856 helps restore hydraulic clutch operation in vehicles such as Chevrolet C2500 Suburban and GMC K3500 without requiring a universal-fit workaround.

This part cross-references Bosch 13118 and LuK LMC129 for the same application.

What It Is Used For

• Clutch fluid leakage at the master cylinder
• Soft, sinking, or inconsistent clutch pedal feel
• Difficulty disengaging the clutch during shifting
• Hydraulic pressure loss in the clutch system
• Replacement of a worn or malfunctioning OE unit

Installation Notes and Tips

Verify the bore diameter before ordering; this unit is specified for 18 mm applications. Confirm vehicle year, make, and model against the fitment list for Chevrolet C1500, Chevrolet Tahoe, GMC K1500 Suburban, and other listed trucks and SUVs. After installation, bleed the hydraulic system thoroughly and inspect all clutch hydraulic connections for leaks.

Quality Assurance

Dorman manufactures this part as a direct replacement engineered to match original equipment design for the listed applications. The CM126856 is a standard replacement component intended for reliable service in the specified manual transmission fitments.