Quote:
Originally Posted by AMDenels
I think that ground wire must have had something to do with the gauge itself. I couldn't release the parking break because the gauge was reading as too low. Once I reconnected the ground wire the gauge shot up showing the pressure was high.
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i could see an electric interlock based on the physical position of the gauge needle as a way to determine if the bus will release the parking break or not. Its almost a double failsafe - the bus needs to have air AND a working gauge - even if the gauge doesn't work (but theres air), you can't ignore it and drive anyways.