Sounds like the switch is sticking & needs to be replaced. It also acts to cancel the cruise control, so if it isn't releasing, the cruise won't set. My switch is on the brake master cyl, so if your master cyl has been replaced with one having a longer connecting rod going to the brake pedal, that could cause your kind of miscief.
94 Taurus GL 3.8L PEP204A
99 Ranger 4dr 4.0L 5spd Auto
Payload & Tow Pkg
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