General Category > R1200 models

ABS not testing, False rear brake signal

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kr4mo:
I agree with you about them being normally open,  but why would the ZFE see an unplugged switch as a signal that the brake was applied?  The old bad switch was also stuck in the open position.

WayneC:
Good question, one I would not venture an answer on, it does seem rather odd

mike d:

--- Quote ---Brake switches are usually normally open switches which close when brake is used
--- End quote ---

Not in the case of BMW and ABS, they are normally closed, and then open when operated.

Mike

WayneC:
This is one occasion I am pleased to be corrected, the 650GS is not set up that way on either of the ABS units used on the different models

mike d:
Must admit I've not looked at the 650 range, only the 1100, 1150RT and 1200 models.

Mike

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