I recently did a brake job on my 1959 MGA. I bleed the system and my brakes still do not work properly. When I press the pedal it goes to the floor, if a pump the pedal it gets firm and stays firm but if I release the pedal for 15 seconds it goes to the floor again when I press it. I can not find any leaks in the system and I bleed them again tonight just to make sure there was not any air. I am using dot5 fluid. I am guessing the the master cylinder is the issue but I was told when I bought the car a few months ago that it was recently rebuilt. Any suggestions would be great. Thank you. David
David Greene