To share lessons learned. My BigFoot hydraulic jacks are too old and there are no kits available for the older QEI-21. The suggested replacement is QEI-16 at $500 ea. The same pump assy can be reused. I decided to try a full system flush with each jack. That entails aprox 3 liters of DEX-III/MERC for each cylinder system. Using the wiring guide, a short alligator jumper can be used to activate the solenoids while pumping out the old fluid. I used a quart oil hand pump (Slippery Pete) to refill when it was time. In one case, I had my better half doing the extend switch since I could not reach the 12v buss bar. Lesson learned - Don't let it suck air. Takes two different ID hoses - One to fit over the steel line and the other over the nipple. Use a Gal jug for the old fluid.
The backs are done and are solid. Next is the front jacks that are not working very well. Fingers crossed. I will do the front jack at the same time replacing the sway bar mounts.
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