Hello,
I am having issues with my cruise controll i looked at all past fourms of it and cant seem to diagnose the problem. my horn works just fine. all my grounds and connections are clean. a while back i got both my brake booster and vacume replaced (vacume suction is normal) and been having problems since.

do you guys have any ideas and advice?

it would be nice to have my cruise controll back for those long highway rides.

 

What year, model, engine truck do you have?

 

1989 f250 7.3 non turbo automatic E4OD

 

Vacuum dump switch?

 

thats located on the break peddle? correct? what would be wrong with that

 

Yes, it may be out of adjustment.

 

Okay i have located it, how would i go about adjusting it, and how do i know if its in the proper place?

 

Disconnect the vacuum hose from the dump valve to the servo at the servo. Connect a hand vacuum pump to the hose, and pump up a vacuum. If a vacuum cannot be obtained, the hose or the dump valve leaks and should be replaced or adjusted. Step on the brake pedal. The vacuum should be released. If it is not, adjust as described below:

1. Move the valve forward in the retaining clip with the valve plunger contacting the brake pedal adapter and the pedal in the released position until 3.2mm (1/8 inch) or less of the plunger shows.

2. Make sure brake pedal is against the stop in the release position after adjustment.

 

After thinking about this the most likely cause is that your vacuum brake booster is out of adjustment.
This would cause the brake peddle to be too low and the dump valve would be venting.

 

yeah that might be the issue because the break doesnt look to be near the dump valve button. i will post a picture in a minute

 

 

I'm subscribed b/c mine worked on the way home from buying the truck which was a 175 miles one way but then next time I tried it didn't work! Horn works fine but I haven't checked anything else yet. What connections? Behind the steering wheel?

 

You have a different speed control system than the OP.
Yours is all electric (1993) while his is vacuum (1989) controlled.

You may want to start your own thread.

 

Ahh thanks Subford! Was wondering why I didn't have that switch under the peddle. You are the man, I don't know how you know as much as you do about these old Fords but it's very helpful

 

I am confident Bill worked on these when they were new....