Ram 2500 Cummins Pre-Filled Clutch Master and Slave Cylinder

This is a complete clutch hydraulic assembly for manual-transmission Ram heavy-duty trucks with the Cummins inline six: the master cylinder, the slave cylinder and the hydraulic line between them, filled with fluid and sealed at the factory. The listed fitment is Ram 2500 with the 5.9L (2005-2009 as listed) and 6.7L (2007-2010), Ram 3500 with the 5.9L (2005-2007) and 6.7L (2007-2010), and Ram 2500 and 3500 with the 6.7L from 2011-2017. Because the listing's 5.9L years run past the last 5.9L model year, go by your engine and compare the new assembly with the old one before you start.

Replacing the master, slave and line together makes sense on a high-mileage truck. If only the master cylinder is replaced, the old slave is usually the next thing to leak, and every time the system is opened it has to be bled again. A sealed, pre-filled assembly also skips the bleeding step, which is hard to get right on these trucks.

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.