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Vacuum Dump Valve Test

  1. Check vacuum dump valve whenever brake application does not release speed control. Ensure no more than 1/8" of plunger tip is extended when brake pedal is fully released. Disconnect vacuum hose from dump valve to servo, at servo unit. Connect hand-held vacuum pump to hose. Apply vacuum to hose and dump valve.
  2. Press brake pedal. Vacuum should be released. If vacuum is not released, adjust or replace dump valve. If vacuum cannot be obtained, hose or dump valve leaks, and should be replaced.
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