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Not sure what happens to the air but I’m assuming it gets pushed through. I believe the idea is to fill the container a bit and master cylinder reservoir to the top. Pump to 20 psi and then crack the bleeders on the calipers one at a time. The pressure pushes the pressurized fluid in container through the system. I would think to keep opening the reservoir after each caliper would be time consuming and messy. I could be wrong but that’s how I saw it done. No pumping of the brakes necessary unless you are starting with a lot of air already in the system.
Fact check required.
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