fix my cruse control f150 4x4
Start by checking your brake pedal switch and clutch pedal switch(if manual transmission). These tend to cause the most issues. Some have a small rubber plug/plunger that sometimes falls out of the frame of the pedals and pedal won't make full contact with the switches.
I went to a you pick and got the switch on top of the brake booster reservoir. very common on ford truck... hope this helps