Load Sensing Proportioning Valve (W/O Vsc) On-Vehicle Inspection

Set the vehicle to its curb weight.

Place weights (as necessary) on the rear deck until the rear axle load is as shown below.

Standard Rear Axle Load:

Vehicle Type	Specified condition
except 1GR-FE	9807 N (1000 kgf, 2205 lbf)
for 1GR-FE	10297 N (1050 kgf, 2315 lbf)

NOTICE:

1. Be sure that the vehicle is on a level surface before starting the procedure.
   
2. After placing approximately 60 kg (132 lb) more than the set value, remove weights slowly as necessary so that the load is within +/-15 kg (33 lb) of the adjusted value and there is less than a 25 kg (55 lb) difference between the right and left sides.
   

Install SST and bleed air from the brake system.

SST

09709-29018

Raise the front brake fluid pressure to 10000 kPa (107.6 kgf/cm², 1450 psi) by depressing the brake pedal, and measure the rear brake fluid pressure.

Standard Rear Brake Fluid Pressure:

4450 +/-490 kPa (45.4 +/-5.0 kgf/cm², 645 +/-71 psi)

HINT:

1. The pedal should not be depressed twice or released while raising the front brake fluid pressure.
   
2. Read the value of the rear brake fluid pressure after raising and holding the front fluid pressure for 2 seconds.
   

Adjust the length of the No. 2 load sensing spring shackle.
When the rear brake fluid pressure is below the standard pressure, lengthen length A.
When the rear brake fluid pressure is higher than the standard pressure, shorten length A.

Standard Initial Length (A):

190 mm (7.543 in.)

Standard Length (A) after Adjustment:

184 to 196 mm (7.305 to 7.781 in.)

HINT:

The rear brake fluid pressure changes according to the table below by adjusting length A.

Standard Pressure Change:

Changes by 120 kPa (1.2 kgf/cm², 17.6 psi) for every 1 mm (0.0394 in.) change in length A

If the pressure cannot be adjusted by the No. 2 load sensing spring shackle, loosen the nuts and raise or lower the valve body.
When the pressure is below the standard pressure, lower the load sensing valve assembly.
When the pressure is higher than the standard pressure, raise the load sensing valve assembly.

Tighten the nuts.

Torque:

13 N*m{127 kgf*cm, 9 ft.*lbf}

Adjust the length of the No. 2 load sensing spring shackle again.

HINT:

If the length cannot be adjusted, check the load sensing valve assembly.

Check that the master cylinder rear brake fluid pressure changes according to the rear wheel cylinder pressure.

Standard Pressure:

Master Cylinder Pressure	Wheel Cylinder Pressure
2940 kPa (29 kgf/cm2, 428 psi)	1270 +/-200 kPa (13.0 +/-2 kgf/cm2, 185 +/-29 psi)
5880 kPa (59 kgf/cm2, 855 psi)	1720 +/-340 kPa (17.5 +/-3 kgf/cm2, 250 +/-49 psi)