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Load Sensing Proportioning Valve: Pickup

  1. Before diagnosing LSPV, ensure all other brake components are operating properly. When all other brake system components are determined to be okay, perform a functional check of Load Sensing Proportioning Valve (LSPV).
  2. Ensure unladen vehicle is on level ground. Ensure lever is not contacting stopper bolt. See Fig 1 .
    Fig 1: Pickup LSPV
    G100475Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. When lever is pushed toward valve, distance from LSPV lever hole and support hole must be within specification. See LOAD SENSING SPRING LENGTH table under ADJUSTMENTS. If measured distance is not to specification, loosen support attaching bolt. Adjust support until measured distance is within specification.
  4. After measured distance is within specification, connect pressure gauges to input and output ports of LSPV. See Fig 2 . Bleed brake system. Refer to BLEEDING BRAKE SYSTEM in this article.
    Fig 2: LSPV Pressure Gauge Connections
    G100476Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  5. Remove LSPV load sensing spring. Slowly depress brake pedal. See LSPV PRESSURE SPECIFICATIONS table.
  6. Install LSPV load sensing spring. Load weight into rear of vehicle until measured distance is 6 55/64" (174 mm) with lever slightly pressed in. See Fig 1 . Slowly depress brake pedal. See LSPV PRESSURE SPECIFICATIONS table.
    LSPV PRESSURE SPECIFICATIONS

    Inlet Pressure psi (kg/cm2 ) Outlet Pressure psi (kg/cm2 )
    853 (60) (1) 242-327 (17-23)
    1991 (140) (1) 370-526 (26-37)
    1991 (140) (2) (3) 299-583 (21-40)
    (1) LSPV load sensing spring removed.
    (2) LSPV load sensing spring installed.
    (3) On vehicles with 2WD and heavy duty suspension, outlet pressure is 526-697 psi (37-49 kg/cm2 ).
  7. If fluid pressure is not to specification, ensure all other brake system components are okay. If other components are okay, replace LSPV assembly.
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