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NO brakes first thing in morning (ONLY when super cold outside)

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Hi guys,

Anybody ever have this issue:

I start car (2009 acura tl Sh-awd) in the morning, go off the drive and have no power assisted brakes...The pedal is super stiff as well... After 5-10 hard pumps, I heard a faint "click" sound under the hood and the pedal went soft (as it should be) and the brakes are working perfectly.

Any ideas what it could be? I just some research and found a few things about a check valve and the tubing for the vacuum hose/line is contaminated with moisture (so it's freezing) ?

Is it a common issue with these cars and how to fix?

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