After flushing my power steering fluid and replacing the reservoir as a matter of routine maintenance the power steering pump developed a loud whine and there is foam in the reservoir.
I've been troubleshooting this for weeks and in the process have flushed and bled the system four times using CHF 11S, replaced all rubber hoses (1, 3, 9, 11 in diagram), and installed a new power steering pump and reservoir.
I'd appreciate any ideas or suggestions for troubleshooting steps. My bleed procedure is to top off the fluid and turn the wheel from lock to lock with the front tires jacked up until there are no air bubbles surfacing.
This is for a 2006 325xi E90 sedan.
