Jerry if you have the SMC/IDS leveling system as you said in another post, your front slide is controlled with the same system and pump. At least mine is on my 2002 Thunder. The slave cylinder does not return pressure to the reservoir, there is always pressure there, it is a closed system. Pressure on the cylinder holds the slide either in or out. Check all the wiring connections at the solenoids, they sometimes get corroded or wet. Marty