Dorman CM640221 Clutch Master Cylinder

Dorman CM640221 Clutch Master Cylinder

Dorman CM640221 is a direct replacement clutch master cylinder for manual transmission service on select Toyota Tacoma trucks. It is precision-engineered to match the original equipment design for a reliable replacement when the clutch master cylinder is leaking or not operating correctly.

Key Features

• Direct replacement for the original clutch master cylinder
• Fits 2018-2020 Toyota Tacoma applications
• Aluminum construction with zinc finish
• 0.75 bore diameter with piston cylinder design
• Single outlet with M10 x 1.0 outlet thread size
• Remote reservoir design; reservoir not included
• Standard replacement grade for manual transmission repair
• Part number CM640221 for ordering and cross-reference

Detailed Description

This Dorman clutch master cylinder is built for select 2018-2020 Toyota Tacoma models and is intended to replace the original hydraulic unit with the same OE-style design. The aluminum body, piston-type cylinder, and 0.75 bore diameter support consistent clutch hydraulic operation, while the zinc finish helps protect the component in underhood conditions. CM640221 is a practical choice for restoring clutch pedal hydraulic function on a Toyota Tacoma with a leaking or malfunctioning master cylinder.

This part cross-references LuK LMC589 for the same application. The Dorman CM640221 part number is also useful when verifying the correct replacement during clutch hydraulic service.

What It Helps Fix

• Clutch pedal that sinks or loses hydraulic pressure
• External fluid leakage at the master cylinder
• Difficulty disengaging the clutch
• Inconsistent or soft clutch pedal feel
• Hydraulic clutch operation problems on manual transmission Tacoma models

Installation Notes and Tips

Fits 2018-2020 Toyota Tacoma, N/A. Confirm the outlet thread size, bore diameter, and remote reservoir layout before installation. Because this unit is not pre-bled and does not include a reservoir, the hydraulic system will need to be filled and bled after installation. Inspect the clutch line, fittings, and related hydraulic components for wear or contamination during service. Verify the part number CM640221 against the removed component before assembly.

Quality Assurance

Dorman manufactures this clutch master cylinder as a standard replacement component engineered to match the original equipment design for the listed Toyota Tacoma applications.