This morning i went to start the chevelle up and take it out and the brake pedal went all the way down to the floor without having to put alott of pressure on it, normally it would go halfway down easily then would give some tension. Last night it was normal when i put it in the garage. The car still stops, but not quit as good. They are 4 wheel drums, i just started driving it daily since tues. I adjusted all the brakes before then and put brake fluid in the car. What could the problem be? thanks alott

Need more info, is it low on fluid again, do you see any leaking around the the base of the cyl (where it bolts to the booster or firewall)?

I opened up the cyl and saw that the fluid was only filled about 1/4 if not left so i filled it up to about 3/4 and the pedal had alott more tension, i guess that was the problem.

Brake fluid is likely leaking some where. It dosn't just vanish. Better check those wheel cylinders for leaks!