Dorman CM640026 Clutch Master Cylinder

Dorman CM640026 Clutch Master Cylinder

Dorman CM640026 is a standard replacement clutch master cylinder for manual transmission systems that need a direct-fit hydraulic repair. It is precision-engineered to match the original equipment design for specific Volkswagen and Audi applications, including Passat, A4, A4 Quattro, A6 Quattro, S4, and Allroad Quattro models.

With a 19 mm bore diameter and OE-style construction, this clutch master cylinder is built for consistent pedal response and reliable hydraulic operation. The Dorman CM640026 is a practical choice when the original unit is leaking, sticking, or no longer maintaining proper clutch engagement.

Key Features

• 19 mm bore diameter for the specified manual transmission applications
• Standard replacement design for direct OE-style fitment
• Precision-engineered to match original equipment dimensions
• Package contents: clutch master cylinder
• Fits select Volkswagen Passat and Audi A4-family applications

Detailed Description

This clutch master cylinder is intended for drivers servicing hydraulic clutch systems on select Volkswagen and Audi vehicles. It supports the clutch pedal-to-hydraulic circuit interface, helping restore proper pressure transfer when the original cylinder shows signs of wear. Dorman CM640026 is cross-referenced with LuK LMC352 for the same application.

Compatible With 1998-2005 Volkswagen Passat, 2000-2002 Audi S4, 1998-2001 Audi A4, 1998-2001 Audi A4 Quattro, 1998-2001 Audi A6 Quattro, 2001 Audi Allroad Quattro, and 1997 Audi A4 Quattro with bore: 19 mm; from VIN 8D-V-170 679. This part number, CM640026, is also listed among OE-style replacements for these manual transmission platforms.

Common Repair Reasons

• Clutch pedal feels soft or inconsistent
• Hydraulic fluid is leaking from the master cylinder
• Clutch engagement or disengagement becomes difficult
• Pedal travel changes after cylinder wear or internal seal failure
• Manual transmission clutch operation is no longer smooth

Installation Notes and Tips

Verify bore diameter and vehicle fitment before installation. This unit is listed for specific Volkswagen Passat and Audi applications, so confirm the year, model, and VIN note where applicable. After installation, bleed the hydraulic system thoroughly to remove air and restore proper clutch pedal feel.

Quality Assurance

Dorman supplies this clutch master cylinder as a standard replacement part engineered to match original equipment design for the listed applications. The CM640026 is built for direct replacement use in confirmed fitment vehicles.