From the pedal or around it, I think (like I hear the spring squeek) <BOOSTER or what>???!!!!??

Happens every time I push down on the pedal while the vehicle is in park---I could play a tune with my foot pedal....And while in motion it has very weak pedal pressure from the hydraulic aspect i think?

I can still drive and stop the vehicle of course....Just takes a little longer...The seals were changed and the lines were bled and that is it!

(5 months ago the breaks were changed). The symptoms are recent after the cylinder/seals and bleed job....but the noise is as recent as 2 months now....

Sorry if I can't explain it correctly.....
Lot's of info MEchanic.....Am I getting that you say master cylinder too??????

I will take it in on Monday....