Toyota Pick-ups/Land Cruiser/4Runner 1970-1988

Load Sensing Proportioning Valve

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The purpose of this valve is to control the fluid pressure applied to the brakes to prevent rear wheel lock-up during weight transfer at high speed stops.

This valve can not be rebuilt. It must be replaced.

REMOVAL & INSTALLATION

  1. Disconnect the brake lines going to the valve.
  2.  
  3. Remove the mounting bolt, if used, and remove the valve.
  4.  

  1. Installation is the reverse of removal.
  2.  
  3. Bleed the brake system.
  4.  

ADJUSTMENT



See Figure 1

  1. Pull down the load sensing spring to determine that the piston moves slowly.
  2.  
  3. Set the valve body so that the piston lightly touches the load sensing spring.
  4.  
  5. Tighten the mounting bolts.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Load sensing proportioning valve

 
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