Any suggestions as to why when cold (below 15*f) at start up and first braking my pedal is super hard to push and truck does not want to stop. After the first stop or if I push-release and push again it softens up and acts normal. Only does it when really cold and at first braking.

 

I responded to your other thread. And I see you made two more. Please DO NOT make multiple threads for the same issue.