brake booster adjustment??
 

I just put a rebuilt brake booster on my 90' f150 and it sounds like there is a vacuum leak when I listen by the brake pedal. It doesn't seem to be as loud if I push slightly on the brake pedal. The only thing I can think of is adjusting the booster pushrod. As I didn't check it before I installed it. Is there any other adjustments anywhere? Or any other ideas on what this noise is?

This write-up from SeattleFSB should work on your truck: Brake Booster Pushrod Adjustment - FSB Forums