I bet the fluid is black as heck. I know mine was. I changed mine out about 5 times and it looks good ans is much less nosiy now. Took ablut 5 quarts of fluid total.
All i did was take off the upper connector on the rack and let it drain into a pan. then I would re-fill the resivour a couple times. re-connect the line and refill the system. drive a few hundred miles and repeat. the first times i was amazed at the metallic junk that came out of my PS system. Now it has been about 5k miles since the last change and the fluid is still red.
Chris