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TSB 05-04-98

Height Sensing Proportioning Valve Removal

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Models: 1997-99 BR/BE trucks

THIS BULLETIN APPLIES TO 2500 SERIES 4X4 VEHICLES THAT ARE CONTINUOUSLY OPERATED A 75% OR GREATER GVW AND HAVE THEIR REAR SUSPENSION ALTERED TO INCREASE RIDE HEIGHT AND ARE BUILT AFTER THE FOLLOWING DATES:

• LAGO ALBERTO ("M" IN THE 11TH VIN POSITION) AFTER APRIL 3, 1997  MDH 0403XX
• ST. LOUIS NORTH ("J" IN THE 11TH POSITION)  AFTER MARCH 17, 1998 MDH 0301XX
• SALTILLIO PLANT ("G" IN THE 11TH POSITION) AFTER APRIL 3, 1997 MDH 0403XX

Those vehicles are equipped with a rear height sensing valve that adjusts brake pressure to the rear brakes based upon the distance between the vehicles frame and rear axle.

In situations where the vehicle is operated ALL THE TIME at or above 75% of the GVW AND the vehicle suspension has been altered, removal of the rear height sensing device may be necessary to help prolong the front pad life and provide suitable braking performance.

CAUTION:  THIS PROCEDURE SHOULD ONLY BE PERFORMED ON 2500 SERIES 4X4 VEHICLES THAT ARE CONTINUOUSLY OPERATED AT 75% OR GREATER GVW AND HAVE HAD THEIR REAR SUSPENSION ALTERED.

Parts:

1    52009575AB   HOSE, Brake

Repair:

This bulletin involves replacing the rear height sensing proportioning valve with a brake hose.

1. Raise and support vehicle.
2. Remove link from axle bracket (fig 1).
• 
3. Remove the brake line adapter from the rear height sensing proportioning valve bracket (fig 2).
• 
4. Remove the hose from the axle.
5. Remove two nuts from frame mounting bracket and remove valve assembly.
6. Attach new brake hose to brake line bracket on frame rail.
7. Connect brake line at frame to new hose.
8. Bleed the brake system.

Notes:

Policy: Information only

This page was edited on: May 3, 2004