It usually is the cruise control servo that goes out but to be sure lets make sure it is getting power and ground. Also, test the brake light switch. Here is the wiring diagrams and a guide to help you run some simple test and see how the system works:
https://www.2carpros.com/articles/how-to-check-wiring
Check out the diagrams (below). Please let us know what happens.
Cheers, Ken
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Saturday, June 23rd, 2018 AT 1:00 PM