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Using Vacuum Pump

  1. Disconnect vacuum line from diaphragm unit and attach vacuum pump. See Figure . Apply parking and service brakes. Start engine and apply 15 in. Hg of vacuum to diaphragm unit. Read and record control pressures in all selector positions.
  2. Bring engine RPM to 1000. Reduce vacuum to 10 in. Hg. Read and record control pressures in "OD", "D", "2" and "1" selector positions.
  3. Reduce vacuum to one in. Hg. Read and record control pressures in "OD", "D", "2", "1" and "R" selector positions. Refer to the appropriate CONTROL PRESSURE SPECIFICATIONS  table and also to CONTROL PRESSURE TEST RESULTS  .
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