I have replaced master cylinder because my brake pedal wouldnt hold it would drop to the floor..I still have the same problem. Could the new master cylinder be bad?

 

Bleed the brakes, check for leaks.

 

Yes bleed your brakes. What you described is a common symptom of air in the lines.

Sent from my Droid

 

i have bleed the brakes 3 times, no air

 

i just replaced the master in mine, then the booster(really hard pedal) i belive in mine the rear brake cylinders are leaking, (has an extremely soft pedal) i believe the brake booster is adjustable not sure. what about sitting in a dry parking lot, and pumping the brakes alot then getting out to see if theres fluid anywhere, maybe a bad line, loose connection.? let us know how you make out and good luck!