I chose not to do either of these tasks before the ToD GTG in Fontana Dam, NC this past weekend. Brakes worked fine all weekend. I did a complete fluid flush back in AUG/2016 when I installed SS brake lines all around. I filled the system with Pentosin Super Dot4 back then. Thought I remembered the brakes being firmer back then than they are now. Think I'll bleed the system again (per your suggestion) with the car running (like James did) & see if the brake pedal feel improves. I may end up still installing a new master cylinder but I'll wait & see. Just hard for me to believe the master cylinder would go bad with only 20k on the ODO (ODO turned over 20k right as I pulled into my driveway on Sunday).