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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Disc Brake System & Drum Brake System >> Adjustments >> Height-Sensing Proportioning Valve >> "P" Series

"P" Series

  1. Raise vehicle at frame rails, allowing rear axle to hang free. Remove nut and lever from valve shaft. See Fig 2. Select appropriate adjustment gauge (available from manufacturer). Rotate valve shaft to permit installation of gauge.
  2. Install gauge with flat on valve shaft indexed to flat on gauge, and tang on gauge inserted in valve mounting hole. Install lever (DO NOT pull lever onto shaft using nut). Install nut. Break off tang on gauge. Lower and test-drive vehicle.
Fig 1: Height-Sensing Proportioning Valve ("C" & "K" Series)
G91B13756Courtesy of GENERAL MOTORS CORP.
Fig 2: Height-Sensing Proportioning Valve ("P" Series)
G91C13757Courtesy of GENERAL MOTORS CORP.
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