They wouldn't.
You have a problem, and it's hazardous to your health.
Brakes usually cost for this saturn around the $35-45 price range,which include brakes and labor
Possible worn out brakes
You either got the wrong master cylinder or you haven't actually bled all the air out of the system.
windsheild leaks
Saturn has no floor it is just a huge gas ball really. Humans would never get there anyway because the pressure is too intense.... we'll never really know.
vacaum leak or bad throttle position sensor. gm Jim
broken inner seals on your brake's master cylinder
Have your brake system checked immediately! (by a proffesional)
I would say a vacumn leak. Check hoses, measure vacumn with running at idle and at idle when brakes applied. This assumes you have power brakes and it idles well without the brakes applied. Please make sure that the clutch is working properly... Does your clutch work properly?
A leak in the brake booster is one common reason why a car would stall or hesitate when the brakes are pushed. There could also be an obstruction in the brake line.
bad mastercylinder.
Check your sunroof drain hose. mine came loose and when it rained my floorboard was wet.