Usually the switches strip out the threads and they will no longer maintain adjustment. The brake arm should contact the stop on the pedal assembly and the switch should be adjusted where the plunger is depressed fully into the switch case. Basically the brake pedal arm should contact the stop and almost touch the end of the threaded portion of the switch at the same time. I would expect to see the plunger extend out between an eighth to a quarter inch before the contacts close and the circuit is made. If the switch is extended too close to the arm it becomes the stop and will be battered, and if it is too far away from the arm the contacts might close and activate the switch without the pedal being depressed.
I would check that the arm can swing free without binding so it always returns against the stop with the plunger depressed fully.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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