Dodge Repair: air in brake lines, grand caravan, brake booster

Question
I have had work done on my 2003 Grand Caravan brakes and my brake pedal still goes down to the floor. The master cylinder has been replaced along with the calipers and brake pads.THe brake lines have been drained four times and when the brake is depressed it's pulling in air and the pedal goes down to the floor(Left front brake is the one having the problem.It has cost me seven hundred dollars and no one can guarantee my brakes will ever be fixed as they can't find the problem. Would you have any suggestions? Thank you. Donna

Answer
take it to better tech and ones that are not guessing at the prob and wasting your money.
calipers and pads have nothing to do with the pedal going to the floor unless there is a leak.  possible master cly  a better one,brake booster or a leak some where in the lines.