Load Sensing Proportioning Valve Replacement

Removal Procedure

Caution: Refer to Brake Fluid Irritant Caution in Service Precautions.

Notice: Refer to Brake Fluid Damage to Electrical Connections Notice in Service Precautions.





1. Clean around the reservoir cap (1) and remove the fluid with a syringe.
2. Raise and support the vehicle. Refer to Vehicle Lifting.





3. Disconnect the brake pipes (3,4) from the Load Sensing Proportioning Valve (LSPV) (1).





4. Remove the 2 bolts (8) in order to separate the LSPV from the frame.
5. Remove the one bolt (5) in order to remove the LSPV (9), the LSPV spring (6), and the LSPV stay (4), from the vehicle.
6. Remove the LSPV spring (6) and the LSPV stay (4) from the lever (7).


Installation Procedure





1. Apply multipurpose grease to the upper pivot point (1) and the lower pivot point (2) of the spring.





2. Install the LSPV spring (6) and the LSPV stay (4) to the lever (7) of the LSPV assembly.
3. Install the LSPV assembly to the vehicle body.

Notice: Refer to Fastener Notice in Service Precautions.

4. Install the LSPV assembly bolts (8).
^ Tighten the bolts to 23 Nm (17.0 ft. lbs.).
5. Install the LSPV stay bolt (5).
^ Tighten the bolt to 23 Nm (17.0 ft. lbs.).





6. Install the brake pipes to the LSPV.
^ Tighten the brake pipe flare nuts (3,4) to 16 Nm (11.5 ft. lbs.).
^ Tighten the bleeder plug to 7.5 Nm (66.4 inch lbs.).
7. Lower the vehicle.
8. Fill the brake fluid reservoir. Refer to Master Cylinder Reservoir Filling.
9. Bleed the air from the hydraulic brake system. Refer to Hydraulic Brake System Bleeding.
10. Place the vehicle on a level floor.
11. Verify the vehicle trim height is correct. Refer to Trim Height Inspection Procedure and to Trim Height Specifications in Suspension General Diagnosis.





12. Push up the LSPV lever (1) with your finger until the lever stops. Measure the length of the coil spring (2).
^ The coil spring should measure 103 mm (4.06 inch) between the spring ends.





13. If necessary, adjust the spring by changing the position of the stay (4).
^ Tighten the stay bolt to 23 Nm (17.0 ft. lbs.).
14. Inspect the LSPV body and the brake pipe joints. Verify that these components are free from fluid leakage.
15. Measure the brake pedal travel. Refer to Brake Pedal Travel.