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Home >> Toyota >> 1998 >> RAV4 Base, 2D Utility, AWD, Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes & Drum Brakes >> Testing >> Load-Sensing Proportioning Valve (LSPV) & By-Pass Valve (BPV) >> Land Cruiser (1997), Previa, Tacoma, T100, 4Runner

Land Cruiser (1997), Previa, Tacoma, T100, 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 (09709-29018) 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)
    Land Cruiser (1997) 2932 (1330)
    Previa 2028 (920)
    Tacoma
    2WD 1543 (700)
    4WD 1874 (850)
    T100
    2WD 1-Ton 1874 (850)
    2WD 1/2-Ton (Standard) 1764 (800)
    2WD 1/2-Ton (W/Soft Ride) 1874 (850)
    4WD 2315 (1050)
    4Runner 2037 (924)
    LSPV PRESSURE SPECIFICATIONS

    Model/Application Front Pressure psi (kg/cm2 ) Rear Pressure psi (kg/cm2 )
    Land Cruiser (1997) 1138 (80) 783-955 (55-67)
    Previa
    Rear Disc Brake 1280 (90) 967-1108 (68-78)
    Rear Drum Brake 1422 (100) 831-967 (58-68)
    Tacoma
    2WD 1138 (80) 640-782 (45-55)
    4WD 1138 (80) 569-711 (40-50)
    T100 1138 (80) 701-843 (49-59)
    4Runner 996 (70) 398-569 (28-40)
  3. Adjust rear pressure (except 4Runner) 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 (Tacoma Shown; Land Cruiser (1997) & T100 Is Similar)
    G98J12822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NO. 2 SHACKLE LENGTH SPECIFICATIONS

    Model/Application Standard Length In. (mm) Adjustment Range In. (mm)
    Land Cruiser (1997) 3.54 (90) 3.31-3.78 (84-96)
    Tacoma
    2WD 3.07 (78) 2.83-3.31 (72-84)
    4WD 4.72 (120) 4.49-4.96 (114-126)
    T100 4.72 (120) 4.49-4.96 (114-126)
  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 (LAND CRUISER (1997), TACOMA, T100 & 4RUNNER) table. If measured value does not meet specification, replace valve assembly.
VALVE BODY ADJUSTMENT PRESSURE SPECIFICATIONS (LAND CRUISER (1997), TACOMA, T100 & 4RUNNER)

Model/Application Front Pressure psi (kg/cm2 ) Rear Pressure psi (kg/cm2 )
Land Cruiser (1997)
1st Reading 498 (35) 498 (35)
2nd Reading 783 (55) 527-612 (37-43)
3rd Reading 1424 (100) 655-797 (46-56)
Tacoma (2WD)
1st Reading 285 (20) 285 (20)
2nd Reading 570 (40) 327-384 (23-27)
3rd Reading 998 (70) 412-512 (29-36)
Tacoma (4WD)
1st Reading 213 (15) 213 (15)
2nd Reading 570 (40) 256-313 (18-22)
3rd Reading 996 (70) 320-420 (22.5-29.5)
T100
1st Reading 285 (20) 285 (20)
2nd Reading 570 (40) 313-370 (22-26)
3rd Reading 998 (70) 378-478 (26.5-33.5)
4Runner
1997 (1) 996 (70) 320-420 (22.5-29.5)
1998 (1) 996 (70) 393-563 (27.6-39.6)
(1) For 1997-98 4Runner, only one adjustment pressure is indicated.