Cruise Control Problems, 1996 Dodge B3500, 5.2L

[tomnorman457]

Our cruise control just started acting up. It worked perfectly in the past. The green light comes on when we turn the cruise control on. But nothing happens when we press the "set" button. When pressing the "set" button, the van does not accelerate so we can designate a constant speed. Sometimes, if we fiddle with the "resume" button and the accelerator pedal, the cruise control kicks in. (possibly at a previously set speed?) But, even after doing the "resume" button/accelerator pedal fiddling, the speed doesn't remain constant; sometimes the van keeps accelerating without pressing the accelerator. The cruise always turns off, as it should, when the brake pedal is depressed.

Where do I start checking? Is the switch on the steering wheel bad? The cruise servo module? The cruise vacuum canister? The Dodge Service Manual says the cruise servo module and vacuum canister are located behind the passenger-side front fender extension, but I wanted to get some opinions before I started digging into anything.

Thanks, Tom

["007"]

The set switch maybe bad plus there maybe a switch on brake pedal that if possible can be adjusted when brake is fully in rest position.
For example the switch on the Workhorse chassis can be adjusted by turning the brake released plunger in or out. You may have same if its that type switch if not need new one.

[tomnorman457]

UPDATE: It's Fixed

I removed the small section of fender trim to access the cruise control components. And I found out why the cruise control wasn't working. The vacuum lines and fittings were all OK. But a support "leg" for the black plastic cruise control vacuum reservoir had snapped off, making a large hole, meaning no vacuum was going to the cruise control servo. I used a liberal application of plumber's "Goop" to repair the vacuum reservoir, and let it cure overnight. The cruise control worked flawlessly today when I road-tested it. Tom