I learned two tricks when doing this task. First buy a cheap Turkey Baster and use it to remove the old fluid from the master cylinder. Put the old fluid into used water bottles and seal them up. No need to "push" the dirty fluid thru your system. Next, fill the master cylinder to the top with clean fluid before installing the pressure bleeder. It makes the process go much quicker. Throw the Turkey Baster and any left over fluid away because they will be no good in a short time. Remember to clean the pressure bleeder and accessories with Denatured Alchol when you finish.