Question about 2008 Ford F 450 Super Duty
Cruise control not working, brake light on
Forgive this if it seems I am being condescending; I promise I am not. You have already answered half of your problem. The Cruise will NOT work when it thinks you have your foot on the brake. I would suggest you start at the brake light switch first. It may have simply slipped back in the bracket, causing the brake light to come on. If a barrel clip type bracket and you can push the switch back into its closed position, my guess is your problems will both go away.
Posted on Apr 16, 2014
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Posted on Jan 02, 2017
check under the dash st the brake pedal,there is a brake light switch which is tied into the cruise control,you could try unplugging that and see if it fixes the problem(remember you will have no brake lights while it's unhooked) if the problem is gone replace the switch.
Posted on Apr 30, 2009
Check the fuses, if they are blown, make sure they are the right size. If not, do not use bigger fuses than the circuit is supposed to have. If they are too small, use the correct size. If they are, do you have any extra equipment using the same circuit? Like a stereo or GPS or an alarm system? Move them to a different circuit. Check the relays to see if they are defective. Check all the bulbs to make sure they are the right ones too. Make sure they are in the right way. Check grounding wires, make sure they have good connections.
Posted on Aug 26, 2009
ive had the exact same thing happen to me on my 2005 ford f-150. it was the sensor attached to the top of the brake pedal. i just jiggled it and its worked fine ever since.
Posted on Mar 01, 2010
check the linkage from the cruise servo to the throttle.
and make sure the vacuum servor is connected to the vacuum line and check that the servo is not leaking vacuum.
hope this helps
Posted on Mar 19, 2010
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