Anyone know anything about disc brakes?

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Cranky in reply to @TurtleRecall

Why?

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TurtleRecall in reply to @Cranky

Because Lezyne pumps screw onto the valve, you pump the tyre up, unscrew the pump and it unscrews the valve core with it, releasing all air from the tyre. Happened to me three times in a row yesterday on my new bike. Finally managed to get it sorted by greasing the valve first and screwing the pump on so gently as to barely be pushing any air into it.

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edscoble in reply to @TurtleRecall

Because Lezyne pumps screw onto the valve, you pump the tyre up, unscrew the pump and it unscrews the valve core with it.

Pressing the little button on the side didn't work?

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