[Rrrockhound]

There's no need to remove the old fluid from the reservoir before you start. You'll be flushing it all through anyway, and besides, you want to minimize how much you handle the fluid since you don't want to splash or spill it.

Most Porsche guys use a different color brake fluid than the old fluid they are changing out. That way you can tell when all the old fluid is flushed through. That is, if the fluid in the reservoir is amber, use new blue fluid, or vice versa. I use clear tubing and flush into a clear jar to make it easier to tell.

And no, the air in the pressure bleeder won't enter the lines, unless you start with too little fluid and end up running out while you're bleeding. If you do, you have to start over. Bad. More flushing. More handling brake fluid. Once you have flushed all the old fluid and air bubbles from all the lines, you're done. You open the pump bottle and the vacuum disappears. Watch for spillage. BTW: I think 3 feet of tubing from the bottle to the reservoir is way too much.

One other tip: I also keep a bucket of warm, soapy water and a sponge on hand in case any brake fluid spills onto the paint or my painted garage floor. If it does, I flood it quick, to hell with the mess. You don't want that stuff on any painted surface.