I got all of the air out of the lines. Fresh fluid, bled a pint or so through each bleeder using my power bleeder. Total finished up a quart of DOT3. There is no fluid leaks.

I still have this noise in my pedal, the booster is new, as is everything else in my brake system. I have a CVR pump to pull vacuum upon ignition power. The booster will hold full vacuum overnight.

Pedal drops when I key on and start pulling a vacuum. Lasts a good 4-6 pumps until the pedal gets stiff. Pedal isn’t hitting the floor.

Is this hissing noise just me hearing the air leaving my booster and I can’t just hear it because I have no sound deadening in the cabin? I can’t think of anything else?