Sounds like your power booster is bad. You are hearing a vacuum leak on the booster when you push the brake. It will also be accompanied by a harder than normal pedal.
I have the same problem on my 2010 hhr but the pedal is soft. Goes to the floor but a hissing sound coming from where the brake pedal rod goes into? Replaced the abs pump, and a bad drum cylinder. Blend the brakes and still have the same problem? I don't know if it is the booster or the master cylinder?
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