The power brake booster will run with the egnition full off with the key off and removed and yes it runs in the ACC position as well. As far as the steering thing, if the car is rolling if steers no different the the older cars that did not have powerstering. My very first car with power steering was a 1983 Pontiac, before that all the cars I had driven were manual steering and non power brakes. I took my driving test in 1968 in a 1967 Volvo 244 with 4 on the floor No power stering and manual 4 wheel disk brakes and I passed on the first try.
CAD-Man
CAD-Man