Load-Sensing Proportioning Valve (LSPV) & By-Pass Valve (BPV): 4Runner

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  table.
   NOTE: DO NOT depress brake pedal more than once or release pedal while setting pressure on front gauge.
2. Attach pressure gauge set to front caliper and rear wheel cylinder. 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.
3. Adjust rear pressure by changing length "A" or "B". See Fig 1. To increase rear pressure reading, decrease distance "A" or "B". To decrease rear pressure reading, increase distance "A" or "B". If valve cannot be adjusted to specification, replace valve assembly.

NOTE: To adjust pressure, turning adjusting nut one complete turn (360 degrees) will change pressure 14 psi (1.0 kg/cm² ). If adjusting nut is moved up or down .04" (1.0 mm), pressure will change 6 psi (.4 kg/cm² ).

Fig 1: Making LSPV Pressure Adjustment (4Runner)

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