Brakes

[frank1966]

Hello everyone,
this is my second post, iam brand new to the mopar world and just got my 70 charger rt delivered today! Brakes are horrible! I hear a hissing or air movement when I hit the brakes? I hardly have brakes the car barely stops? Where do I look first? I assume this noise is not normal to mopar. There are no brake fluid leaks, I may need from more fluid in the MC but its not empty drawing in air.
thanks

[Cooter]

Power brake booster leaking vacuum causing a massively stiff pedal.

[frank1966]

booster leak internally? where do I look for a leak?

[Cooter]

booster leak internally? where do I look for a leak?

To test my  Theory, uncool vacuum hose from booster. See if hissing us still there. If my, then bad booster.
no way to "see" vacuum leak internally in booster, just replace.