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2010 Range Rover Autobiography
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Can a bad brake accumulator prevent ABS pump from operating? Or is this more likely due to a bad ABS pressure switch? Relay checks out OK (relay test becnh test OK, and I have 12v at the control pin). Pump operates if I jump it at the relay pins. Can a collapsed accumulator force the pressure switch to never trigger?
 

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1995-2002 Range Rover P38A
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Short answer: NO

Longer answer:Yes, the switch being faulty would be a possible cause.
Check for continuity on the switch. it should ring out as closed with no pressure.
 
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