I changed rear brake pads on my 1993 Del Sol SI and a piston dust seal (had piston out of bore)-brake pedal went to floor after trying to bleed brakes (no air in lines)-replaced master cylinder-pedall stil goes to floor and no air is in lines at bleeders and no air at master cylinder lines-never seen anything like it-help?

 

did you do them in the correct order ? also have you looked for any leaks ?

 

Look for a leak where you replaced the seal and elsewhere.

Bleed the brakes with the car turned on. Bleed thoroughly. I use the bottle and vacuum hose method. It's better and faster than the pump and hold method that cavemen developed before the ice age when you could get a brontosaurus burger for 5 cents.

Check for a stuck caliper pin.

Usually do these steps before replacing a master cylinder that worked fine before.