Product Description
The F1251CV is a heavy-duty hydraulic brake master cylinder designed for older International Harvester and Navistar commercial truck braking systems.
This master cylinder features a 1-3/4-inch bore and incorporates a residual check valve to maintain a small amount of hydraulic pressure in the brake system when the brakes are released. The F1251CV is associated with Wagner casting number FE777 and uses 1/2-20 threaded hydraulic connections.
The F1251CV configuration was used on older International Harvester K-Series trucks and other heavy-duty hydraulic brake systems requiring the FE777-style master cylinder with a residual check valve.
Part Number: F1251CV
Product Type: Hydraulic Brake Master Cylinder
Vehicle Family: International Harvester / Navistar
Bore Diameter: 1-3/4 in.
Casting Number: FE777
Port Thread: 1/2-20
Residual Check Valve: Yes
Mounting Style: 4-Bolt
Brake Fluid: Standard hydraulic brake fluid
Installation Note: Requires appropriate fitting with copper gasket
The F1251CV differs from similar FE777-style master cylinders that do not contain a residual check valve. Always verify the original part number, casting number, bore diameter, mounting pattern, hydraulic connections, and check-valve requirements before ordering.
