All right I have a tough one for you guys. My brakes work normal most of the time but for some reason, when driving on the highway for over 15 minutes or sometimes the first drive in the morning or even after holding the pedal for a long period of time, something happens to my brakes where my pedal becomes very firm and doesn't do anything even if I stomp on them as hard as possible. I need to pump the pedal six or seven times until the car finally starts to slow down. I've done the usual vacuum check valve test and for some reason the results were reversed of what they were supposed to be. I took the hose off of the filter side of the intake and was able to blow air through but not suck. I'm currently at a loss and any help would be appreciated. I'd bring it to the dealer but I just spent 1500$ replacing the TB with a few other things along with 1200$ for winter tires and rims, so I'm on a tight budget atm.