Re: Blue Bird Dash lite
..............or very likely the pressure sensor/wiring is defective.
i had the same problem in one of my bus', light and buzzer came on while on a road trip. Brakes worked just fine, electric backup was not coming on when the engine was running. with the engine off backup electric motor worked fine. i was not low on fluid, brakes worked perfect. i had yet to drive through the mountains on my way to nevada and was worried about this light/buzzer.
I determined that the brakes were working just fine, (so was my ps) so i just unhooked the buzzer. When i arrived home i talked to one of the mechanics at the local bus garage and he thought it was probably a faulty pressure sensor.
one dissadvantage of disconnecting the buzzer is that this is the same device that alerts you to engine overheating (and prob low oil pressure)
i never did track down the problem, but i drove at least 10 thousand miles with no problems.
Quis custodiet ipsos custodes (who will watch the watchmen?)