"What is different about doing this the pedal vs. using the pressure bleeder?"
Amount of brake fluid expelled. The air is sitting in the MC. To push it all the way through the system requires a lot of fluid and still may not get the job done as the air may be bubbling back up to the MC while the fresh fluid is flowing by it.
That is why bench bleeding is recommended to be done first. To get the air out of the MC before installation.
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1980 245 Canadian B21A with SU carb, M46 trans, 3:31 dif, in Brampton, Ont.
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