I have 1 2003 olds Alero 2.2 180,000 miles. When I received the car from a friend the pedal was low. They stated getting a hose replaced so I figured the system possibly had air in it.
I bleed the brakes at the brake hose at two of the floor wheels because the bleeder screws were rusted and broken off. This did not help at all actually may have made it worse. I have bleed the system numerous times with no resolution. The master cylinder doesn't have an abs module attached, (not where I can see it) not sure if it has some other device. The pedal is firm when the car is not started.. Once started it goes to the floor.
brake booster or hose? I haven't noticed the car running funny or any hissing noises when started coming from the booster area. Not losing in fluid either