I’m going to do the brake fluid flush next weekend, and I watched a few videos and posts about how to do it. I plan to do it in the tradition two-person way. The very first step is to use syringe to extrude the old fluid from the reservoir and fill with the new one. My question is how much should I extrude? Some people said only get it down the minimum line and some people said get out as much as you can. If only making it down to the minimum line, doesn’t the new fluid and old fluid will be mixed together?