I have a problem that has developed and is getting worse. When driving the truck, it would pull to the right but would stop when tapping the brakes. I replaced the passenger brake line and caliper, front and rear. This fixed the problem until I put in in 4x4. The steering felt like it was still in 4x4 after unlocking hubs until i smacked the hubs with a dead blow. No more problems until recently when it started pulling again to the right. I messed with the hubs and helped but not a complete fix. This past weekend I washed the motor off and now it pulls in both directions. Checked the power steering fluid - full and appears to be brown, not red, and smells burnt and looks to be aftermarket unit. When I say it pulls, it's not constant. It's at random and feels like someone is jerking the wheel. Counter steer feels about the same as running on to a very soft shoulder in whatever direction it is pulling.