I've just done the front brakes (rotors, pads and calipers) on my mom's 2001 Stratus SE (4 cyl engine). She drove it to me, so the brakes were working alright before (but with warped rotors and such).

Anyhoo, I get done and my friends and I bleed the brakes thoroughly, and the pedal still sinks to the floor. We went around all 4 wheels and bled, to be sure the air was out, but to no avail. I tried gravity bleeding, an hour with all 4 bleeder screws just open a wee bit, and after that, the pedal would firm up with the car off, but when it was turned on, the pedal went to the floor again. If you pump several times it firms up a bit, but wait (for the booster, essentiallY), and it's on the floor again. I was thinking of master cylinder, but it doesn't make sense that it would just be fine and then go.

I read another post here about rear hoses deteriorating on these cars and causing a clog, but when bleeding, fluid would indeed come out at all 4 wheels. Is it possible for a clog to do this without noticeably obstructing the fluid from coming out the screws?

I've done brakes on cars several times and have never had this sort of problem. If someone could tell me what may be the reason for this, I'd be most grateful .

 

If this has rear drum brakes, you might want to check the wheel cylinders for leaking. Push on the the rubber boots and see if there is any weeping of brake fluid.