I recently took my 2008 toyota sequioa to a 'canadian chain oil change' place. I normally do my own oil changes but i didnt have the tool for the cartridge style oil filter on the newer tundra/sequoias. anyway i had my own oil and toyota filter with me so it was a cheap/low hassle way to go given the change is about $50cad. They do an inspection of the other fluids and told me that the power steering fluid was bad and would cost 80+90 plus tax to change. i declined and said i'd do it myself. when i sucked out the old fluid from the reservoir using a little hand pump from the auto store, it was blackish so obvious that was bad. But then (following youtube video instructions) i refilled the reservoir with good fluid and then turned the steering each way several times before sucking out the fluid again, i repeated this three times but no more because other than the first fluid suck out, the fluid was nice clean red. I even took the car for the test drive with lots of turning to see if i just wasnt getting the fluid circulating. But still the fluid in the reservoir was a nice clean red. So now i'm wondering if the fluid was basically good and that the oil change place just dumped in bad fluid into my reservoir to scam me, is this the case or is it normal to only need to suck out the reservoir once and refill without needing to repeat serveral time as the video i watched online suggested? i dont know how much fluid is in the system in the lines,pump,steering box etc, but it seems strange to me that the reservoir would only need the one empty refill.
sediment will collect wherever there is no flow (the reservoir). But I wouldn't be surprised if they tried to pull something like that. That's why I never go to those places.