Steering Pump.

[Audi4.2]

Just flushed my steering fluid, how do i bleed the system?

[Audi4.2]

Steered left to right and it still made the sound, kept doing for 20 min and now no noise.

[nitrolvr33]

That's exactly how you bleed it. Fill it all the way up, then drive for 20-30 miles and it'll bleed itself.

[Audiudo]

Did you end up using more than one can?

[Audi4.2]

nope, what i did is disconnect both lines, the small one in a container and connect a compressor to the other and shoot the old fluid out like that with air. I still have a little leftover from the one bottle :D