There was a recent bench bleeding thread and I am starting this one instead of highjacking his. I always have this argument with my buddy:
We both agree that bench bleeding a used MC or doing any kind of on-car bleeding of a used or in-use MC requires a short stroke or wood block under the pedal. The reasoning is that when a brake system is properly bled and in use the piston stroke rarely goes past a certain point and corrosion and whatever can build up past that point and rip or damage the o-ring if it is made to sweep past the rough part.
My argument that he doesn't agree with is that if it's a NEW or REMAN MC the whole bore should be clean and even and ready to seal to the piston's o-ring. Therefore you shouldn't have to worry about giving the piston a full stroke- it won't be damaged and you will bleed faster.
Kinda funny- I use a mity-vac now for all bleeding. It saves a bunch of time and my wife used to groan whenever I would call her out to the garage for brake pedal duty.
What's your take? Any pros wanna chime in?
