In prep for my trackday, I flushed out the brake fluid in my Boxster S early this week ( it was over due anyways.)
I had trouble getting it done with 1L of fluid, or it's hard to tell when the old fluid transitions to new fluid at the bleeder. Without dye options available, it's hard to judge between almost clear of new to the light amber of old.
I was able to empty 90% of the reservoir at the master cylinder with a vacuum device, and used a motive power bleeder to do the task. I ended up with a lower level then minimum at the reservoir when done, and I topped up the reservoir with fluid from a recently openned bottle.
How much fluid do you think is in the brake lines to the back? the diameter of the tubing is pretty small... 30cc -60cc ( 1-2 fl oz?)