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Answer 1IF the switch is KNOWN to be good, then the problem is one of two things.

First, the proper adjustment of brake light switches IS CRITICAL to proper operation.

IF the adjustment is proper, then the only other cause would be that, somehow, the and/or a (any) "hot" wire is in contact with the wire from the brake light switch to the brake lights. This is a very unusual and almost never occurring situation.

Most brake light switches are adjusted via screw threads on the mounting end of the switch which screws in or out of the mounting bracket which is also threaded.

The best method of adjusting the switch is to have a helper stand at the rear of the vehicle to keep you posted regarding the ON-OFF status of the brake lights while you trial adjust the switch.

To adjust the switch where the lights are staying on, "unscrew"/back out the switch from the mount just until the brake lights go out.

Then press the brake pedal to make sure that you did not back the switch out too far. If so, screw it back in, one quarter turn at a time [testing between each adjustment] JUST UNTIL the brake lights turn on when the pedal is depresed, but goes out when the pedal is released. Good luck.

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Q: Why do your brake lights stays on and you tried changing the switch but it still stays on?
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