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I used to bench bleed my master cylinders many years ago but quit when I discovered they'll self bleed in just a few minutes. Just mount them, attach the lines, fill them, wait about 5 minutes, then slowly pump the pedal about 25 times. At first you'll have no brakes but each pump will provide more brakes and after 25 pumps you'll almost have full brakes.

The next trick is to coast (no braking) down a steep hill to purge the tiny amount of trapped air in the front of the bore(s). Any incline steep enough to put your master cylinder in a nose down position for a few seconds will do.

And avoid "no name" Chinese master cylinders.
 

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