Dorman - First Stop Clutch Master Cylinder CM640087
Dorman - First Stop Clutch Master Cylinder CM640087 - view 2
Dorman - First Stop Clutch Master Cylinder CM640087 - view 3
Dorman - First Stop Clutch Master Cylinder CM640087 - view 4
Dorman - First Stop Clutch Master Cylinder CM640087 - view 5
Dorman - First Stop Clutch Master Cylinder CM640087
Dorman - First Stop Clutch Master Cylinder CM640087 - view 2
Dorman - First Stop Clutch Master Cylinder CM640087 - view 3
Dorman - First Stop Clutch Master Cylinder CM640087 - view 4
Dorman - First Stop Clutch Master Cylinder CM640087 - view 5

Dorman - First Stop Clutch Master Cylinder P/N:CM640087

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$145.99
MPN: CM640087
Item Package Quantity: 1

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Dorman - First Stop Clutch Master Cylinder P/N:CM640087
Dorman - First Stop Clutch Master Cylinder P/N:CM640087
$145.99

Leaking or spongy clutch pedal? The Dorman - First Stop Clutch Master Cylinder CM640087 generates the hydraulic pressure that translates pedal force into clutch actuation, and it drops in as a direct-fit replacement for a range of medium-duty trucks — including the 1997-1998 Chevrolet T6500 [L6-6.6L], 1998-2002 Chevrolet T7500 [L6-7.2L], 2006-2008 GMC T7500 [L6-7.8L], and 1997-1998 Isuzu FSR [L6-7.1L]. See the Buyer's Guide tab for the full list of 24 applications across Chevrolet, GMC and Isuzu with the L6-6.6L, L6-7.1L, L6-7.2L, L6-7.8L and V8-6.0L engines.

  • Direct replacement: built to match the original clutch master cylinder in the listed vehicles.
  • Precise design: reverse-engineered from original equipment to fit and function reliably.
  • Durable materials: includes high-grade rubber components for compatibility with standard brake fluid.
  • Trustworthy value: backed by a team of engineers and quality control experts in the United States.

If a failed or leaking master cylinder is the cause of a soft or dropping clutch pedal, this unit replaces it. Country of origin: Mexico. Package contains the clutch master cylinder; item grade Standard Replacement.

Interchange: CM452560 · 15028481 · 15059358 · 15255966 · 15742592 · 15988020 · 8150284810 · CM141901 · CM142259 · F141901 · F142259 · Manufacturer part number CM640087 · Part Eazy SKU CM640087

This part cross-references / interchanges with the following part numbers:

CM452560, 15028481, 15059358, 15255966, 15742592, 15988020, 8150284810, CM141901, CM142259, F141901, F142259

Frequently Asked Questions

What does the clutch master cylinder do?

It converts clutch pedal force into hydraulic pressure that travels to the slave cylinder to disengage the clutch. This is the CM640087 replacement unit.

Will this fit my truck?

It's a direct-fit replacement for 24 listed Chevrolet, GMC and Isuzu applications. Check the Buyer's Guide tab for your exact year, model and engine before ordering.

What fluid does it use?

It includes high-grade rubber components compatible with standard brake fluid. Consult your vehicle service information for the specified fluid and fill procedure.

What are signs this part may need replacing?

A leaking cylinder, or a soft, spongy or dropping clutch pedal, may indicate a failed master cylinder. Diagnose the cause before replacing, as other components can produce similar symptoms.

Which part numbers does it interchange with?

It cross-references CM452560, 15028481, 15059358, 15255966, 15742592, 15988020, 8150284810, CM141901, CM142259, F141901 and F142259.

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