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Not all of it. If you remove a caliper piston and look at the relationship of the brake like entry and the bleed port you’ll see that as the area behind the caliper piston fills up with fluid, an air pocket will inevitably be trapped at the caliper bleed port

So is it your thought that any air bubble upstream of the caliper is being continually forced upward by the fluid moving down to the bleeder screw? Thus eventually being expelled as bubbles in the master cylinder reservoir?

I see what you’re saying. The bleed screw is the high point on the caliper, but all you’re bleeding is the air bubble that’s trapped behind the piston in the caliper. When you replaced the caliper, you also disconnected the banjo fitting, which introduced an air bubble upstream of the banjo...

So you do an initial gravity bleed, go do the panic stops, then a final gravity bleed?

When you say pressure pump you’re referring to something like a Mitivac?

I understand how the column of brake fluid moves down with gravity. What confuses me is that the bubble of air will always remain above the column of fluid as it moves down. Thus, never allowing the air to make it to the bleeder screw.

Can someone please explain to me how this could work? Let’s say I disconnect the banjo bolt at the caliper of a car. Air is introduced and will inevitably float upstream (read: at a higher point than the caliper). Seems to me that no amount of fluid dribbling down at the caliper is going to...