it’s time to bleed the system. “Bleed” is a pretty accurate way to describe the process, since it seems inevitable at some point you’ll have red fluid spewing out of the system. Begin by topping off the reservoir. Start the truck and slowly cycle the steering back and forth. The fluid will become foamy. Shut the truck off and wait for it to settle. Top off the fluid again if needed. Start the truck again and while running, crack open the bleeder valve on the top of the steering box until fluid flows out. Some boxes have this bleeder (looks just like a brake bleeder), and some do not. If it doesn’t, loosen the adjuster nut on the top, as it will serve the same purpose. Repeat the above steps until air is purged.