[scarceller]

Helpful tip I learned years ago for bleeding master cyl.

Look carefully at the orientation of the master cyl and how it sits naturally when installed in the car. Imagine you are an air bubble inside that cyl, where would you migrate to? Get an imaginary visual of where air would naturally sit.

Now, let us assume the cyl has the piston pump side at one end and the outlet line of the other end. And if this cyl sits tilted so that the piston side sits higher than the outlet you have a issue! No matter how many pumps you pump the piston you will never move ALL the air to the outlet! This is the single biggest mistake in achieving rock solid bleeding! Does not matter how you bleed, power bleeder, old school, ... if you do not orientate the air bubble so it's near the outlet you will leave some air in the master cyl!

How do you fix this? Simply jack the car up as need be to favor any air to move to the outlet(s) of the master cyl. You may need to jack the front or the rear higher and/or also jack the left side or right side higher. Bottom line is study the orientation of the master cyl and understand how/where air bubble will be sitting.