Hello all! I've been a lurker on these forums and finally decided to sign up!
I have a 2014 Cruze LT and I've had this problem with the brakes in the morning. Now it seems like it's the exact same issue as others I've seen on here with the power braking and the switch, but mine seems different and I had it serviced. My problem only arises when it is bitterly cold I live in the Chicago suburbs so it's been getting single digits to negative with wind chill and in the morning my brake pedal is hard as a rock and takes a few pumps to get the vacuum. At first I didn't realize this issue and had that common problem of putting it in reverse and having to exert more force to brake and almost had to pull the E-brake. I took it in to my dealer as I only have 4k miles left on my extended warranty and they didn't believe me as they "couldn't duplicate the problem" but I told them to keep the car overnight and start it in the morning and sure enough the tech said he needed to replace the booster assembly. This ended up not being the issue as I still have the problem on really cold mornings, but today when it was 40 degrees out I was able to start the car and go right away with no issues. So, what causes this issue when it is so cold out? Should I just let it warm up a little? Again brand new brake booster didn't fix the problem and I wonder if I should call the dealer back though I am hesitant as they gave me hassle the whole time.