You can do it on the car.
Just crack open the brake line fittings at the exit ports on the master cylinder. Depress the brake pedal and hold it down with something. Tighten the fittings and let the brake pedal up. Test for pedal firmness. If it is still soft, repeat.
Basically on pedal depression, you're expelling the air that has collected at the top of the system which is hard to remove because it keeps bubbling up while the fluid is flowing down and out through the calipers. And on pedal release (with lines closed) fluid is sucked in from the MC to fill the void being created.
Wipe up (or wash off) the small amount of expelled brake fluid.
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1980 245 Canadian B21A with SU carb, M46 trans, 3:31 dif, in Brampton, Ont.
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