Pass. rear, Driver's rear, pass. front, then driver's front is the usual order. I use an old turkey baster to suck out as much of the old brake fluid out of the master cylinder first and then top it off with new fluid and then proceed to bleed the brakes. If you use a clear plastic hose on the bleeder you can see when new fluid is pumped out of the caliper as well as any air bubbles. ;)