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Load-Sensing Proportioning Valve (LSPV) & By-Pass Valve (BPV)

  1. For testing purposes, rear axle is loaded to a specified weight. Set total rear axle weight to specified amount. See LSPV REAR AXLE TEST WEIGHT .
    NOTE: DO NOT depress brake pedal more than once or release pedal while setting pressure on front gauge.
  2. Attach Pressure Gauge Set (09709-29017) to front caliper and rear wheel cylinder or caliper. Bleed air from system. See BLEEDING BRAKE SYSTEM . Depress brake pedal until front pressure is as specified. See LSPV PRESSURE SPECIFICATIONS table. Wait 2 seconds and record rear pressure reading.
    LSPV REAR AXLE TEST WEIGHT

    Application Lbs. (kg)
    LX 450/Land Cruiser 2932 (1330)
    LSPV PRESSURE SPECIFICATIONS

    Application Front Pressure psi (kg/cm2 ) Rear Pressure psi (kg/cm2 )
    LX 450/Land Cruiser 1138 (80) 783-955 (55-67)
  3. Adjust rear pressure by changing length of No. 2 shackle (if necessary). See Fig 1. To increase rear pressure reading, increase distance "A". To decrease rear pressure reading, decrease distance "A".
  4. Repeat pressure tests after adjusting shackle length. If rear pressures fail specification after adjustment, reposition valve body. Raise valve body if rear pressures are too high, lower valve body if rear pressures are too low.
  5. Ensure No. 2 shackle length is within adjustment range. If shackle is removed or replaced, adjust No. 2 shackle to standard length. See NO. 2 SHACKLE LENGTH SPECIFICATIONS table.
    Fig 1: Measuring LSPV No. 2 Shackle Length
    G91G03643Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NO. 2 SHACKLE LENGTH SPECIFICATIONS

    Application Standard Length
    In. (mm)    		 Adjustment Range In. (mm)
    LX 450/Land Cruiser 3.54 (90) 3.31-3.78 (84-96)
  6. If pressures cannot be adjusted to specification, check valve housing. Position valve body in uppermost position. Apply brakes and record rear brake pressures. See VALVE BODY ADJUSTMENT PRESSURE SPECIFICATIONS table. If measured value does not meet specification, replace valve assembly.
VALVE BODY ADJUSTMENT PRESSURE SPECIFICATIONS

Application Front Pressure psi (kg/cm2 ) Rear Pressure psi (kg/cm2 )
1st Reading 498 (35) 498 (35)
2nd Reading 783 (55) 527-612 (37-43)
3rd Reading 1424 (100) 655-797 (46-56)
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