When the vehicle has sat for a while "cold" and you drive it the brakes are fine. Full firm pedal. But after 5 minutes and a few stops the pedal goes about half way down and starts to apply rear brakes first. The longer you drive the worst it gets. Eventually it's like back brakes only. Let it sit 12 hours or so and it normal for first few stops then slowly back to rear only. Replaced master, front and rear brakes, turned front and new rear drums,New front and rear rubber hoses. Professionally lines bled. Still not right. Any advice appreciated

 

Welcome!

 

You might have some alignment issue, check out this section for more details:
https://www.f150online.com/forums/1997-2003-f-150-118/

Welcome!

 

Check your flexible brake hoses on all 4 corners both static and pressurized

 

Abs?

 

I have a 2001 and the abs light on,checked everything,seems to be ok. What am i not seeing?