Quote Originally Posted by bam-bam View Post
I'm not sure I agree. The diagonal separation of the brake system happens at the master cylinder.
You say no leaks- is the fluid level down at all? A master cylinder leaking back into the booster can destroy the vacuum diaphragm as well. Your hearing 'air leak' at m/c goes along with a vacuum leak from the booster. Does the engine surge when you apply the brakes at idle?

Loosen the master cylinder mounting nuts and ease it forward. There shouldn't be any fluid there.
fluid level stays up, when applying brake engine level doesnt seem to change but when you release pedal it speeds up some.I loosen master cylinder and there was no fluid in there just kinda greasy

I also noticed that when applying brake at idle it would go to one point stop and then you would feel like a bump in pedal then it would go down further to the floor