yep... vacum leak at the booster or lines going from the manifold to the booster and sounds like you still may have a bad master cylinder. Seems odd both would go out at the same time tho... check the line and connections for the booster first.
the parts should be cheap even at your local discount auto. Call around. The only real problem will be bleeding the brake system (purging of air)when you are done. If you have never done it get someone who has to give you a hand. If you don't bleed the brakes (ms and lines) properly, all the new parts in the world won't help.
lazs
