bad brakes and chirping sound from valve cover

[scottly]

I've read most of the threads about brake problems and the PCV and burst disks. The car in question is a '14 Lt turbo, auto trans, less than 12,000 miles.
Last week, after a 9 mile drive and a short stop, as I backed out of the parking spot and applied the brake, it felt solid as a rock!! Normally the brakes are extremely touchy. Most of the time the brakes act normal, but it has happened several times in the last week, always while at very low speeds, thankfully.
The intake manifold PCV valve appears to be there; I do see an orange tit with a mirror. What would pop the valve cover disk if the intake valve is intact? Anyone got a good pic of the disk?
Oh yeah, the power-train warranty expires next week...
I forgot to add that the chirping noise was happening long before the brake problem started, and I also thought it was the belt squeaking until I checked closer.

 

[scottly]

I pulled the cover off the valve cover, and the burst disk is not leaking. The chirping/squeaking is coming from the passenger side of the motor, but I can't tell if it's coming from the serpentine belt or not for sure. In any case, there is nothing wrong with the pcv system that would explain the lack of vacuum to the brake booster that I've had. If I pull the dip stick, I can hear the air sucking in. The brake fluid level is at the full mark. The only other thing I can add is that the brake problem has happened when the ambient temp was about 100* F.

 

[dtbrown]

If you're Powertrain Warranty is still valid have them inspect it and ask if they can identify the source of the sound. At minimum I'd hope they'll diagnose the issue and you can tackle it yourself or if they're really nice they'll fix it under warranty.

I've had a weird almost soft spring noise every time I press the break. When I took it in and they had to rebuild my motor at 10k miles they said it was the belts but they fixed it. Never went away and it's definitely something with front breaks, I think a caliper. Either way I'm about to upgrade my breaks and see if I can find it.

 

[calebsullivan3]

Any update scottly? I am having sort of similar issues I suppose but I cannot pin down what exactly is going on. I had a chirp sound in the same location as you but also had terrible idle and smoke from the exhaust. I ended up having to mod the intake manifold with the fix kit from the CruzeTalk page. Did all this and car is idling and running fine now but the chirp is till there and though I have not had the brake problems you are experiencing my vac pump is going on and off repeatedly while the car is idling. Do you have a check engine light and trouble codes?

Edit: Prior to modding the intake manifold I replaced the valve cover since it was much quicker. The part I put on was not OEM and was causing the chirp. Put the OEM one in from the shed and the chirp is gone but the vacuum pump kicking on and off remains a mystery...