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Just recently did a hydroboost swap in my 89 f250.
I noticed this truck uses a vacuum dump valve for cruise control actuated by a white plastic part on the pedal. I modified a vacuum pedal by moving the pin, so I didn't have a parts truck to look at. Did the f superduties with cruise control use these as well? Also I noticed without the part on the pedal, the pedal seems to return much higher than the vacuum system. I attached a picture with the piece I'm talking about. Any help or guidance would be greatly appreciated
Couple things that may or may not be helpful to those in the future. The vacuum pedal works with hydroboost. Rotate the pushrod and the brake light switch 180 degrees. It'll line up well and work without binding.
I found I had an extremely low brake pedal. Found the reman booster I got has the incorrect length pushrod which is around 1" too short. Always measure. It should stick out about 1" from the mounting flange on the booster.
A company sells a cut to fit pushrod that fits all hydroboosts that will fix my issue.
Vacuum booster pushrod Booster with incorrect pushrod Ford booster with correct pushrod length
Bump. To be sure someone's run across this issue before on a 80-91 truck being swapped?
I think the F-Superduty also had the setup, just different part number for the plastic bit cause different location of pin? I'll be honest I did mine ages ago so I don't remember all the details anymore, and truck is currently an ocean away so can't just go and snap some pictures, but the cruise vacuum dump always worked right for me so I must have had all the proper parts there.
You want a crazy idea? Add another one of those valves to your clutch if you're running a bolt-action transmission, then you can do away with the troublesome electric switch on the clutch pushrod, which both allows you to use an adjustable pushrod with a heim joint and also makes it so the cruise reingages automatically after you've shifted gears without any input needed from you at the steering wheel. Also makes it so the truck will start without having to push the clutch in, which sounds kinda unsafe till you realize other manufacturers elsewhere in the world have been doing it for ages (my Pajero Mk2 for example has zero safeties on the clutch), but if you wanted to avoid that a GM brake switch from an 80s truck will do the job nicely.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
