I suggest that the servo is getting stuck in the engaged position because:
1) Electrically, turning off the switch should have disengaged it. Failure to disengage at that point would tend to indicte that it is NOT an electrical problem, and point towards a mechanical problem.
2) Hitting the brake SHOULD dump the vacuum to the servo. The servo is operated by a vacuum diaphragm much similar to your power brake booster. Dumping the vacuum should cause it to immediately release the throttle. There is a vacuum dump switch on the brake linkage that you should be able to check out.
These two items pretty much rule out a vacuum or electrical problem. My vote is to replace the servo. Also check for any binding or restriction in the linkages. Overall, I would say that with 99% certainty, your problem is mechanical, and the prime suspect is the servo.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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