Brake booster noise

[snake]

When I push down on the brakes, I'm hearing a "groaning" sort of noise from inside the cabin. As I push harder it makes more noise and sometimes does it as I let up on the pedal as well. Sounds like the rod is dragging the firewall or something. It has been doing this intermittently for about a year. When it first started doing this I looked under the dash and didn't see anything amiss, so figured I'd worry about it later. Now it is getting a lot worse. Could this be the booster going out? It doesn't make noise as long as the pedal is held in one place. I figured I ask before I took it apart as maybe someone else on here has experienced the same goofy thing.

 

[MAKG]

It sounds more to me like the bushing between the booster and the pedal. You might try greasing it.

 

[snake]

K. Thanks.