cruise control not working sometimes

[flonly]

Ok where to start.Well I have had trouble with the cruise control not working right for as long as i can remember .Oh this is a 08 t660 kw.It will work then you will try to set it another time later and the screan will say that you need to press brake for it to work.when you do that then try to set it it will ony engage a second or not at all.It was working great for like 2 months then it got colder outside like mid 40's and back to same trouble.could there be a sensor outside the truck like on the transmission or something that cold weather is affecting?anyone have any trouble like this my right leg would appreciate the help