Cruise not worked since rear end change?

[6 Nebraska IDIs]

Hey guys,
The cruise hasnt worked in my dads old truck (90 F250) since we changed the rear in it. What would cause this? Any ideas will help.
Thanks!

 

[dansvan]

speed sensor now missing...

 

[6 Nebraska IDIs]

I really need to get this working this weekend because on thursday I have to drive this truck 600+ miles.
The horn works, so the switches have power. There's a small plug pluging into the master cyl that had some corosion on it cleaned that off. I dont know what else to do with it. It seems to me like this series of speed controller is the crappiest of all ford used.

 

[6 Nebraska IDIs]

Oh and the speedo wouldnt work if the speed sensor was missing.

 

[Ironman03R]

That connector on the M/C is the cruise disable switch. I check that out more. Maybe swap one from another truck...

 

[Mont91]

The '91 and older IDIs used a speed sensor on the tranny tail for everything but Rear anti lock brakes, that sensor was on the rear end. The cruise cancel on these was a vacuum break switch on the brake pedal. The speedo is mechanical but there is also a speed sensor as stated, this runs the cruise and tranny computer(if it is an auto). If it is a standard then it only runs the cruise. Did you check for codes?

 

[6 Nebraska IDIs]

Well I cleaned all the connections, checked the cable to make sure it still worked, and checked the fuse. Still nothing. Cant seem to get a parts store that carries the servo either.

 

[6 Nebraska IDIs]

What's the plug coming out of the master then? You're not talking about the break light switch attached to the pedal are you? I dont know of any vacuum switches on the pedal.

 

[6 Nebraska IDIs]

HAHAHAHAHAHA!!!!
Got it working!!! For one trip anyway.
It was the vacuum brake switch that I didnt know anything about. lol
Thanks guys!!
But now coming back from town it wouldnt work again.
Is it possible for these switches to go bad?

 

[6 Nebraska IDIs]

Well now it doesnt work again.
Well it works intermitantly. Like I pulled the pressure switch off the pedal and manually would press it in and it would work one time and the next it wouldnt. Then when I got it working I tried testing it stopping so I let it out and it slowed down. But I pressed it in again and it took right off, no touching buttons or nothing.
Then after I finally got it to shut off somehow, it wouldnt start again. ***?