My 2005 Caravan has a weird brake problem. Disc on front and drums on rear. Does not have ABS. 2 weeks ago while driving I applied the brakes and the pedal went almost to the floor before there was any breaking. Quite scary..This happened about 5 or 6 times before I got home. I checked everything and could find no leaks of any kind. The fluid container is also full. After pumping the pedal it seemed OK. Now, 2 weeks later it happened again while driving home. I did notice when this happened that if I pump the brake pedal immediately after I have good brakes again but not for long. The only work that has been done was the front rotors and pads were changed about 8 months ago.
Could it be air in the lines, or new fluid required...I don't know.
Any help on this would be greatly appreciated.

Thanks Harry

 

I wonder how old the master cylinder is? I know you said you saw no leaks. It seems if air were in the lines then you would see/feel your problem more often then you are, right?

 

I would say master cylinder has failed,causing the pedal to feel like you have air in the system. It maybe time to replace the master cylinder.