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Pump up the power bleeder. It may take a little while, especially if you've drained the system to replace hoses or something similar. Keep an eye on the gauge. It doesn't take a lot of pressure, just 5 to 10 psi.

Keep an eye around your brake fluid reservoir for leaks as you pump up the brake bleeder. The reservoir is not usually under pressure during use so leaks may show up where they hadn't before, especially in these two locations:

The sensor float caps on top of the reservoir

The rubber seals between the reservoir on the master cylinder

If you discover a leak you may need to stop the bleeding process to replace these bad seals. Or, alternately, try a method of brake bleeding that does no use a pressure bleeder. You will need to research these methods elsewhere.

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