Cruise Control Disengages

[Lucky Eddy]

I have a problem on one particular road where cruise control disengages without me touching the brake pedal.

Its admittedly a sealed but bumpy winding section of road.

On the new freeway which is smooth as - I can go for maybe an hour before it will occasionally just disengage cruise control by itself - whereas on the bumpy road it happens every few kms.

Could it be that the break pedal moves a little by itself with the bumps and the disconnect sensor is too finely set?

Is it an easy fix?

Maybe there's something else? Does it work by maybe a dirty sensor on the tail shaft that counts RPM'S to maintain the speed or something?

Hoping this is something simple...(and cheap) that I can rectify myself.

Thanks in advance!

[hpdcsi]

It began with the cruise disengaging every so often, then I noticed that when I would hit a bump in the road, it would disengage. Now, I can't get it to engage. Looking forward to your thoughts. So for, I have been able to fix or replace any problem that I came across by looking it up on the forum

[7.3coal roller]

figure out a way to monitor your brake lights. if they are on when your trying to engage cruise control its probably a bad brake pedal switch.

[codyryan07]

Idk if its anything like my other ford, but IIRC almost all cruise controls are held by vacuum..

you could possibly have a leak in a line somewhere that would open up just enough with a bump or something and over time, grew causing your no cruise issue.

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[bob harris]

its probably your brake pedal switch needs adjusting

[GunnyRappUSMC]

Take ur psd to ford theres a recal for that exact problem... Ill try to get the recall number... But they can look it up by your vin... Y worry let them fix it... fyi im pretty sure diesels dont use vacum... Lol



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[codyryan07]

Originally Posted by GunnyRappUSMC

Take ur psd to ford theres a recal for that exact problem... Ill try to get the recall number... But they can look it up by your vin... Y worry let them fix it... fyi im pretty sure diesels dont use vacum... Lol



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I forgot about the harness recall.. and I couldn't remember if they did or not. I had a similar problem on my f150 and turned out to be a vacuum leak.

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[GunnyRappUSMC]

Ahh yes but as i said diesels dont have a vacum system i dont think....

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[7.3coal roller]

some diesels have a vacuum pump but thats just for the blend doors in the a/c n heat