I have found that if you don't keep the button pushed for the complete cycle, either up or down the top goes a little crazy and you have to play with the button to get it moving again. Jack

 

My OReilly store carries Pentosin CHF 11s for their BMW customers that use it in their power steering pumps. I have heard on this forum that they're sensitive to the oil level in the resevoir.

Everyone is right that the system purges itself of any bubbles.

Sometimes things have just got to be used before they work better. At least that's what I tell my wife every night.