Hiss sound coming from the 406 engine part

Well, good day everyone used to give my computer a hissing sound at first start, but this sound was not understood without opening the hood yesterday after the car passed a little hard from the car, this sound was heard to be heard from inside the vehicle. can cause my car gasoline lpg (I will add the evening video)

I have the same problem, did you find a solution?

The subject is old but it is a sound called Westinghouse hose coming from the inlet manifold and going to the brake servo and a sound you can hear as a result of tearing the brake diaphragm. If you have low braking performance besides this sound, check / have the hose checked. I was touching a hot part of the engine and making a molten leak. Let me unscrew the hose and see if it's hard plastic, or is there a crack? I was stopping the car hard.