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The reason for the constant running of the ABS Pump is that the Acumulator (round black ball) that sits a top of the ABS pump is shot. It has a charge of nitrogen and maintains pressure in the brake system. I would bet tahat as soon as you depress the brake peddle the abs motor turns on. The acumulator should be replaced asap. The abs motor constantly cycling could cause the motor to burn out. To replace it is big bucks. To replace the accumulator you can purchase it from Jaguar for $350.00 or you can purchase one from a Chevrolet or Buick dealership. Its the same part for around $120.00. The AC Delco part number is 18038506.Mike OConnor

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โˆ™ 2011-09-14 00:07:22
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Q: Why does the ABS pump still turn on and off every 20 seconds even after replacing the relay for XJS V12 1989?
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