Dorman CM640189 Clutch Master Cylinder

Overview of Dorman Clutch Master Cylinder CM640189

The Dorman Clutch Master Cylinder CM640189 is designed for reliable manual transmission operation in select BMW models. Engineered with an aluminum body and an external cylinder design, this clutch master cylinder provides consistent hydraulic pressure for smooth clutch engagement.

• Constructed from durable aluminum material for corrosion resistance
• External cylinder type with a 0.75-inch bore diameter
• Standard replacement grade for dependable performance
• Silver finish complements engine bay aesthetics
• Does not include a reservoir and is not pre-bled or pre-filled
• Package contains one clutch master cylinder

Detailed Product Description

The Dorman CM640189 clutch master cylinder is a direct replacement part designed specifically for manual transmission systems in BMW vehicles such as the 318i, 318is, 318ti, 328i, 328is, M3, and Z3 models. Its aluminum construction offers enhanced durability and resistance to wear compared to standard cast iron components. The external cylinder design facilitates straightforward installation and maintenance. With a bore diameter of 0.75 inches, this clutch master cylinder ensures proper hydraulic pressure for effective clutch operation. The silver finish provides a clean, corrosion-resistant surface that maintains its appearance over time.

Compatible Vehicles and Applications

This clutch master cylinder is compatible with the following BMW models:

• BMW 318i
• BMW 318is
• BMW 318ti
• BMW 328i
• BMW 328is
• BMW M3
• BMW Z3

Common Issues Addressed by This Clutch Master Cylinder

• Difficulty shifting gears due to hydraulic pressure loss
• Clutch pedal feels spongy or soft
• Fluid leaks from the master cylinder area
• Clutch engagement delay or incomplete disengagement
• Reduced clutch system responsiveness

Installation Notes and Tips

• Ensure the hydraulic system is properly bled after installation as this unit is not pre-bled
• Check for compatibility with your specific BMW model and year before installation
• Inspect clutch fluid reservoir and lines for leaks or damage during replacement
• Use recommended brake fluid type for your vehicle
• Follow manufacturer torque specifications for mounting bolts

Quality Assurance and Warranty

Dorman provides this clutch master cylinder as a standard replacement part meeting OEM specifications for fit and function. While the product does not come pre-filled or pre-bled, it is manufactured to maintain consistent hydraulic performance. Warranty coverage details should be confirmed with the point of purchase or Dorman directly.