What happens when the Master Cylinder is low or empty? I believe mine went dry and how does that changing the bleeding procedure?

 

Well, what happens is air gets into the braking system. Use a search on bleeding the ABS unit. If you don't have air in the system, the standard bleeding procedure is RR, LR, RF, LF. If air gets into the ABS I've heard varying techniques ranging from taking it to the dealer so they can cycle the ABS with a Tech 2, to "sprited driving" to kick on the ABS and force the air out, to gravity bleeding the system with the bleeder screws cracked for several hours.

If I wound up with that problem, I would most likely do a gravity bleed first and if that didn't work, I'd take it to the dealer. There should be plenty of info on gravity bleeding on this site.