70 super bee power booster air puff noise when I apply brakes . Any clues why??

[Jimclo2002]

70 super bee power booster, puffs air noise when I apply brakes.
When I apply the brakes slowly I do not get the air puff noise .
The hole brake system is brand new. Brakes are bled multiple times. Pedal feels OK maybe a slightly low pedal.

Fronts are disc/rear drum


Any clues on why this may be happening?

Thanks for any advice that you may have

 

[pnora]

Most likely air being expelled from the bellows boot on the rod under the dash.

 

[Turbobus]

I agree with pnora, did you remove the booster by chance? The reason I ask that is because mine had a piece of dried out open cell foam in the booster boot, looked like a factory piece, a muffler of some sorts maybe? I cut one out of open cell foam, didn’t completely deaden the sound but it wasn’t any worse.

 

[dadsbee]

The one in my Bird does it on a slow push. So it's normal?.. that's nice to hear!

 

[Jimclo2002]

The complete brake system is new. Were you talking about the rubber slinky type tube that is around the rod that would connect to the pedal mechanism?
Should I remove rubber tube piece if it's still on back of the brake booster?
Or is it a bad booster ? Or the rod is too short? Or To long ???

 

[pnora]

The complete brake system is new. Were you talking about the rubber slinky type tube that is around the rod that would connect to the pedal mechanism?
Should I remove rubber tube piece if it's still on back of the brake booster?
Or is it a bad booster ? Or the rod is too short? Or To long ???

Its normal.

 

[toolmanmike]

I have heard that

 

[Turbobus]

The complete brake system is new. Were you talking about the rubber slinky type tube that is around the rod that would connect to the pedal mechanism?
Should I remove rubber tube piece if it's still on back of the brake booster?
Or is it a bad booster ? Or the rod is too short? Or To long ???

It’s a little quieter with the foam but not much. If I had all new components and they were working fine, I personally wouldn’t mess with it. It’s just one of noises old cars make, kinda like that metallic blinker sound or the hideous seat belt buzzer