Recently while driving the highway my torque converter unlocked every time I hit a big bump, such as a bridge approach or rough patch. I was wondering if this could be caused by the brake switch and pedal having a bit of play in them from use? Any help would be greatly appreciated.

 

What do you mean by unlock? The lockup disenguages?

 

try putting a plastic tie stap on your petal arm to take up the slack where the switch hits it. if that fixes it, i would say the switch is worn.Mine did the same thing after towing a trailer.

 

are you talking about the cruse control

 

Try keeping your foot or toe under the brake pedal and then go over the bumps, if it still does it, look into cleaning your tps. Do a search on spliting it or drilling it and spray cleaning it and readjusting it. Goodluck,,Rick

 

https://www.dieseltruckresource.com/...&highlight=tps Here is a good one. If you need photos go to member pappyman photo galler they are posted there. Goodluck,Rick

 

Sounds like your brake pedal switch is on the fritz. Don't bother fooling with it, just buy a new one.
Napa has them for $14.

 

Thanks for all the help folks. No it isn't popping out of cruise, the cruise hasn't worked since I got the truck. Yes, the lockup disengages if you hit a big bump.