O/T Brakes on Truck

Got something going on with the brakes on my 2000 Silverado 2500.
Hit the brakes the other day and the pedal went to the floor let off and it is fine will stay working good for a long time then hit it and it goes to the floor? Just put all new pads rotors and left front wheel bearing unit on it back in October and has work fine ever since?
I have checked for leaks bad lines and leaking calipers and have found nothing? Not losing any brake fluid out of master cylinder?
Anyone have ever had a problem like this? I"m lost? I"m thinking proportining valve or master cylinder?
Not getting any codes either?
Any Ideas? Thanks in advance!
I"m leaving for work (3-11 shift) and won"t be home till 12 tonight so I"ll check back then.
Thanks again.
Bob Smith
 
Bypassing inside the master cylinder sounds like. You wouldn't see a leak or difference in fluid. But I can't imagine it doing it intermittantly though.

Dave
 
Sounds like the master cylinder is going bad. Hit it slow and it goes t the floor hit it fast and hard and works as it should is a sign of a master going bad. BTDT and as long as you have to make panic stops it might work for a long time but I would not count on it
 

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