what would cause my trailer brakes to not work when depressing brake pedal. but work fine with the integrated controller? 2013 F250 6.7 checked fuses and they appear ok.
Your Ford IBC has little brake pedal effect below 20 mph. I often use the manual lever to assist my low speed stop. Also, if you are used to using an after market controller, that has an obvious early brake feel, the integrated is less noticeable.