The Methood I use at the shop when I do any p/s work is fill reservoir then, with front wheels lifted engine off, turn the wheel lock to lock, stopping to top off again. When done turning at least 10 or more times, start car and top off fluid. Then turn slowly lock to lock with engine running. If u get bubbles or foam u have air leak in suction hose or possibly in cooler lines or weak/ loose hose clamps. The recent q45 I acquired had a bad hose clamp causing air to get pulled in, new clamp and tightened fixed. Po thought it needed a new pump....
