Your thoughts on bottoming master cyl when bleeding?

[.RJ]

All Master cyl's are fundamentaly the same - a pushrod, pushes a piston, which seals inside the bore of the cylinder. Most of the time, the piston has a limited range of motion, and if you dont flush brakes for 5 years you can get some corrosion inside the cylinder. When you now push it all the way to the floor, it can damage the seal.

I'm suprised your dealership doesnt use a pressure/vacuum flushing system.