Hi,
This vehicle isn't offered in the US, but I will try my best to help.
First, low tire pressure creates additional drag on the system. I would get them to normal pressure. Also, the creaks are likely the result of a dry bushing, so inspect things like the sway bar bushings and stabilizer links.
When you bleed the PS, raise the vehicle front off the ground. Make sure the reservoir is full and turn the steering wheel from lock to lock. See if that helps bleed it.
Also, inspect the rubber boots where the inner tie-rods attach to the rack and pinion gear for leaks. If there is a bushing failure on the rack, it can also create drag. When there is a bushing issue, often times you will see fluid on the dust covers on the rack.
If that doesn't help, even though you replaced the power steering pump, you may want to consider flushing the old fluid from the rack and pinion and lines to see if that helps. Here is a link that explains how that is done:
https://www.2carpros.com/articles/power-steering-fluid-flush
Let me know if this helps or if you have other questions.
Take care,
Joe
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Friday, May 13th, 2022 AT 9:27 PM