The fluid in my brake and clutch master cylinders is really murky, looks kinda like muddy water. Anyways, I have flushed the fluid out of both twice and each time the fluid looks the same after about a week or so. I was wondering if this was a common thing and if it is a problem? I have not noticed any difference in the functionality of the brakes or clutch before or after flushing, but at the same time I can't see that dirt, or whatever it is, being good for the system. Any ideas or advice would be helpful, thanks guys.