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I'd suggest a pressure switch with some hysteresis, an extra reservoir, and two of those pumps in series.
Starting the pump when you brake will always be too late, even with the tiniest leak, some day when you need the vacuum the most, it will not be there.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
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