Either like wint said as mine does the same thing or check your third brake light. The sockets get melted and you end up with a bad connection and if that circuit gets an open condition the cruise won't work.
Also inspect the brake on switch on end of brake master. If contacts on the switch or connector are corroded or dirty it will shut off or not allow the cruise to be set or maintained.
there is a recall on the brake switch.it will cause cruse problems
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