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Originally Posted by RazM
Besides the brake lights not working, any other dangers if the brake switch dies, or does it just control the lights?
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Brake switch is connected directly to the rear center mounted stop lamp assembly, but for rear brake light operation, the BCM controls this according to input from the switch.
The switch also supplies an output to the electronic brake control module, so the module can determine if traction control or antilock brake logic is used if wheel speed sensors signal a requirement for the EBCM to interact with the vehicle.
Also, an output is supplied to the PCM for TCC lockup.
The EBCM also monitors the brake switch input to compare against master cylinder pressure. If pressure goes up, brakes should be applied, if not, stabilitrack/traction failed will be displayed and the EBCM will not operate correctly.
Also, technicians are incorrectly replacing the brake (or stop lamp) switch versus adjusting the switch; so I believe now the stop lamp switch requires approval to be replaced. (This is common when technicians do not diagnose the problem correctly.)
As for the noise, if it is a creaking noise, I would say it sounds to me like a bushing. I guess it could be the plunger on the switch, but usually creaking is caused by something like a bushing.