Brake Problem in AUI

[OldManGhia]

I have had an on going brake problem that no one seems to be able to fix. The car is a standard AUI ie no ABS. Rotors & pads have been changed and last week the master cylinder was reconditioned. Before that when the brakes were bled through the brake pedal would be high and little effort was needed to stop. What was happening was that after a period of about 6-8 weeks the brakes go soft and spongie and could be pumped up. Since the master cylinder was done the brakes are now soft and spongie although they dont pump up like they used to. Just got the car back again today abd they say they cant find any thing wrong with it.

Has anyone experienced anything like this? Also those of you with an AUI, how would you describe your brakes when you apply them? How much peddle travel and how firm are they?