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 Posted: 08-30-2017 03:44 am
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Esprit2

 

Joined: 05-01-2005
Location: Minneapolis, Minnesota USA
Posts: 289
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Dick,

When you open one hydraulic circuit to bleed it, the PDWA's internal shuttle/ piston will move off to one side, closing the switch contacts in and illuminating the warning light. Then when bleed the second circut, the shuttle will move back the other way, turning off the warning light as it passes center. Finally, as it continues to the opposite extreme, it will once again close the switch contacts, illuminating the warning light.

When you're done bleeding the brakes, no matter which circuit you end with, go to the opposite circuit one last time just to center the PDWA. Open the bleed valve just a little, and slowly bleed out a little fluid until the warning light 'just' goes out... stop! The shuttle is now centered.

Regards,
Tim Engel

Attachment: PDWV - Pressure Differential Warning Valve - Cross-Section Drawing.jpg (Downloaded 44 times)

Last edited on 08-30-2017 03:47 am by Esprit2