FLUID PRESSURE ADJUSTMENT

1. Set the vehicle unladen.

   Fig. 1: The Load Sensing Proportioning and By-pass valve with adjuster is located near the rear axle of the vehicle

   Fig. 2: Load sensing proportioning valve (1), by-pass valve (2) and load sensing spring (3)

2. Measure the rear axle load and note the value.

   Fig. 3: Place the vehicle without a load and measure the rear axle load

3. Set the rear axle load. Standard load is 2028 lbs. (920 kg).
4. Install a Load Sensing Proportioning gauge (SST 09709–29017) and bleed the air from the system.

   Fig. 4: Attach brake pressure gauges to the front and rear brakes, then bleed the lines

   Fig. 5: Rear pressure with rear drum brakes

   Fig. 6: Rear pressure with rear disc brakes and without ABS

   Fig. 7: Rear pressure with rear disc brakes and ABS

5. Raise the front brake pressure to the following specifications and check the pressure of the rear brakes.

   NOTE: The brake pedal should not be depressed twice and returned while setting to the specified pressure.

6. Read the value of the rear pressure 2 seconds after adjusting the specified fluid pressure.
7. If necessary, adjust the fluid pressure:
   1. Adjust the spring shaft length by turning the adjusting nut.
      • Low pressure–lengthen A
      • High pressure–shorten A
   2. For every turn of the adjuster, the fluid pressure with change by about:
      • Rear drum — 28.4 psi (196.1 kPa)
      • Rear disc — 55.5 psi (381.5 kPa)
   3. Tightrn the nut to 9 ft. lbs. (13 Nm).

      Fig. 8: Turning the adjusting nut to lengthen or shorten the pressure

      Fig. 9: Tighten the nut while retaining the adjusting bolt

8. Remove the gauge and bleed the brake system.
9. Check for leaks and test drive the vehicle.