Ford Repair Questions? Ask a Mechanic for Answers ASAP
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The most common fault which fits the exact same scenario you have occuring is a faulty brake pressure switch on the end of the brake master cylinder. This part also had a recall on it so you may find a harness attached to it which may have a blown fuse if this switch is leaking brake fluid.
Here is the wire diagram on this circuit so you can check all the remaining inputs and outputs on the speed control system.