DiamondK Posted March 31, 2020 Share Posted March 31, 2020 I have an RD688 in the shop. I have found three different air switches. two of them turn on the brake light and low air light when crossed with jumper. one does nothing. it is on the back of the blue brake valve. is that where i should be looking for the problem of no brake lights with service brake? Quote Link to comment Share on other sites More sharing options...
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