Ford F-250 Super Duty Clutch Master and Slave Cylinder CC649071

This is a clutch hydraulic assembly for manual-transmission 2006-2007 Ford F-250, F-350, F-450 and F-550 Super Duty trucks: the master cylinder, the hydraulic line and the concentric slave cylinder that sits around the input shaft inside the bellhousing. It crosses to CC649071, PS0721-2, SPH015, SPH064, CRS023 and 136.65528. Both cylinders have cast bodies, and the pedal pushrod and clip come with the master cylinder.

The slave cylinder is inside the bellhousing, so replacing it means the transmission has to come out. That is why most shops put in the complete master, line and slave assembly during a clutch job instead of reusing the old slave, which is the part most likely to leak next.

Signs the clutch hydraulics are failing: the pedal sinks slowly to the floor or stays down, the pedal feels soft or spongy, the reservoir level keeps dropping, brake fluid is wet on the firewall, the frame rail or the bottom of the bellhousing, or the truck grinds going into gear because the clutch no longer releases all the way. If bleeding brings the pedal back for a day and then it goes soft again, a seal is leaking and the part needs replacing, not more bleeding.

When it goes in, match the new parts against the old ones before anything is bolted up: mounting ears, the pedal pushrod end and the line fittings should all line up. After install, bleed or check the system until the pedal is firm and returns all the way, confirm the clutch releases cleanly with the engine running, and fill the reservoir with the fluid type printed on the cap.