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Home >> Toyota >> 1986 >> 4Runner Base, Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc & Drum >> Adjustments >> Load Sensing Proportioning & By-Pass Valve (LSP & BV) >> Land Cruiser, Pickup, 4Runner & Van

Land Cruiser, Pickup, 4Runner & Van

  1. Load sensing proportioning and by-pass valve (LSP & BV or LSPV) is used to control fluid pressures at rear brakes depending upon rear axle load. Specified weight, which includes vehicle weight, is placed on rear axle for testing and adjusting pressures.
  2. Test weight for rear axle load, including vehicle weight, is set at 1543 lbs. (700 kg) for Van and 2WD Pickup models. Test weight for 4WD Pickup models is 1653 lbs. (750 kg). Test weight for Land Cruiser models is 2646 lbs. (1200 kg).
  3. Install Pressure Gauge Set (09709-29017) on vehicle. Connect 1 gauge to front caliper and 1 gauge to rear wheel cylinder. Bleed all air from pressure gauges. Depress brake pedal until pressure reading at front wheel is 711 psi (50 kg/cm2 )). DO NOT depress brake pedal more than once or release pedal when setting test pressure on front gauge.
  4. Wait 2 seconds from setting of test pressure before recording pressure reading from rear gauge. Raise pressure on front gauge to 1422 psi (100 kg/cm2 )) and record pressure reading from rear gauge after 2 seconds. Compare recorded pressures with specified rear brake pressures. See BRAKE PRESSURES  for correct pressure ranges.
    BRAKE PRESSURES

    Application Front Gauge psi (kg/cm2 ) Rear Gauge psi (kg/cm2 )
    Land Cruiser (1)
    1st Reading 711 (50) 498-640 (29-39)
    2nd Reading 1422 (100) 725-925 (51-65)
    Pickup & 4Runner
    2WD (2)
    1st Reading 711 (50) 455-597 (32-42)
    2nd Reading 1422 (100) 696-896 (49-63)
    4WD (3)
    1st Reading 711 (50) 384-526 (27-37)
    2nd Reading 1450 (100) 540-740 (38-52)
    Van (4)
    1st Reading 711 (50) 341-483 (24-34)
    2nd Reading 1422 (100) 384-584 (27-41)
    (1) For testing purposes, set rear axle load at 2646 lbs. (1200 kg) with vehicle weight included.
    (2) For testing purposes, set rear axle load at 1543 lbs. (700 kg) with vehicle weight included.
    (3) For testing purposes, set rear axle load at 1984 lbs. (900 kg) with vehicle weight included.
    (4) For testing purposes, set rear axle load at 2904 lbs. (950 kg) with vehicle weight included.
  5. Adjust fluid pressure if rear pressure readings do not meet specification. Change length of No. 2 shackle to adjust pressures. See Fig 1. If rear pressure readings are low, distance "A" must be increased. If rear pressure readings are high, distance "A" must be decreased.
    Fig 1: Adjusting Brake Fluid Pressures Turn No. 2 shackle 360 for pressure change of 8.5 psi (.6 kg/cm)).
    G50149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Repeat pressure tests after adjusting shackle length. If rear pressures do not meet specification after adjusting No. 2 shackle, reposition valve body. If rear pressures are too high, raise valve body. If rear pressures are too low, move valve body lower.
  7. Adjust length of No. 2 shackle to standard length. Standard length of No. 2 shackle for 4WD Pickup models is 4.72" (120 mm) with adjusting range of 4.49-4.96" (114-126 mm). Standard length of No. 2 shackle on all other models is 3.07" (78 mm) with adjusting range of 2.83-3.31" (72-84 mm).
  8. If pressures cannot be adjusted by changing length of No. 2 shackle within adjusting range, check valve housing. Position valve body in uppermost position. Apply brakes and record rear brake pressures. See VALVE BODY ADJUSTMENT  for specified range. If measured value does not meet specification, replace valve assembly.
VALVE BODY ADJUSTMENT

Application Front Gauge psi (kg/cm2 ) Rear Gauge psi (kg/cm2 )
Land Cruiser
1st Reading 71 (5) 71 (5)
2nd Reading 356 (25) 148-205 (10.4-14.4)
3rd Reading 853 (60) 311-411 (21.9-28.9)
Pickup & 4Runner
1st Reading 71 (5) 71 (5)
2nd Reading 711 (50) . (1) 280-337 (19.7-23.7)
3rd Reading 1138 (80) (2) 424-509 (29.8-35.8)
Van
1st Reading 71 (5) 71 (5)
2nd Reading 356 (25) 100-156 (7-11)
3rd Reading 853 (60) 178-277 (12.5-19.5)
(1) On 4WD, the 2nd reading for rear brake pressure is 203-260 psi (14.3-18.3 kg/cm2 ).
(2) On 4WD, the 3rd reading for rear brake pressure is 296-381 psi (20.8-26.8 kg/cm2 ).
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