I used hydraulic oil purchased at the auto supply. Others have used transmission fluid. I believe the shop manual calls for brake fluid. I had the motor off of mine and was able to fill the reservoir with a small funnel. Then after everything was installed, attach a small hose to the reservoir and the fluid bottle. Run the top up and down and it will siphon out of the bottle and bleed the system.
In my 69 SS Convert I used Dexron II Trans Fluid and it works fine. As Alan said fill the tank with fluid then put a tight hose into the opening and it will suck the fluid it needs out of a quart bottle when you run the top up and down a dozen times. The 1972 Fisher Body manual calls for the use of Dexron II trans fluid that's why I used it.
The air in the lines is bled out by simply raising and lowering the top assembly (with the fill plug out). The method is to put a hose in a container of fluid then it must form an air tight seal to the resovoir. the vacuum will suck the needed fluid into the pump and keep it full while you are bleeding.
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