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    2003 Honda S2000 2.0L MFI VTEC DOHC 4cyl

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    1720 S RIDGEWOOD A
    (386) 427-1210

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    Nissan Pick-ups and Pathfinder 1970-1988

    Load Sensing Proportioning Valve

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    CAUTION
    Brake shoes contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.

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

    REMOVAL & INSTALLATION



    See Figures 1, 2, 3 and 4

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

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

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



    Click image to see an enlarged view

    Fig. Fig. 1: Load sensing proportioning valve (Type A)



    Click image to see an enlarged view

    Fig. Fig. 2: Load sensing proportioning valve (Type B)



    Click image to see an enlarged view

    Fig. Fig. 3: Removing brake line from load sensing proportioning valve



    Click image to see an enlarged view

    Fig. Fig. 4: Bleeding at proportioning valve

    ADJUSTMENT



    1986-88 (D21-D Series)
    HEAVY DUTY MODELS WITH VG30i ENGINE

    See Figure 5

    1. Position approximately 220 lbs. of weight over the rear axle.
    2.  
    3. Install pressure gauges at the front and rear brakes.
    4.  
    5. Depress the brake pedal until the front brake pressure is approximately 711 lbs. Check that the rear brake pressure is 327-469 lbs.
    6.  
    7. Depress the brake pedal until the front brake pressure is approximately 1422 lbs. Check that the rear brake pressure is 455-654 lbs.
    8.  
    9. If the rear brake pressure is not within specifications, move the spring bracket to the left if the pressure is high or to the right if the pressure is low. Repeat this process until the rear brake pressure is correct.
    10.  



    Click image to see an enlarged view

    Fig. Fig. 5: Adjusting the proportioning valve (Type B) - 1986-88 HD with VG30i engines

     
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