Hello first time poster. I am working on a 94 sonoma that has been setting for about 3 yrs. When I first got it running the brake pedal went to the floor. I bled the brakes and they got a little better. Now the pedal will go to the normal position for stopping then slowly drift to the floor. I replaced the master cylinder on someones recomendation but it did not help. I do not know what to try next. Oh and there are no leaks anywhere in the system. If anyone has any ideas your help will be greatly appreciated.

 

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