14 bolt for what is this lever for?

[jwcummings]

14 bolt ff what is this lever for?

 

[jwcummings]

I'm about to swap this 14th to my k20 and was wondering if I needed this

 

[ScottyB]

Is that for load level brake adjustments?

 

[skysurfer]

Yeah, that's the load sensing proportioning valve. Wasn't a great system and GM issued a service bulletin on how to disconnect/bypass it for vehicles that came in under warranty for braking problems. Mine still works so I left it intact but if you dont want to bother with it the brakes will work fine without it. Let me see if I can locate that tsb.

Edit: Found it, thanks chengny for posting this.

Is the load compensator (height sensing valve) still in the rear hydraulic circuit?

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If so you might consider removing/bypassing it.

In 1987 GM issued a TSB on the subject that begins like this:


THIS BULLETIN IS A REVISION OF TRUCK SERVICE BULLETIN 85-B-79, DATED MAY, 1985, UPDATING FOR MODEL YEARS 1984-1988.
1984-1986 C/K 3500 and 1987-1988 R/V 3500 series trucks are equipped with a rear suspension height sensing device that optimizes the brake proportioning valve setting for the load the vehicle is carrying. The height sensing system adjusts the brake balance in vehicles subjected to a range of loading conditions. Occasionally, vehicle modifications by body builders or owners influence the height sensing device. If a vehicle has had rear suspension modifications that affect its trim height or the spring rate, and the driver comments about the brake modulation characteristics of the vehicle, it is recommended that the height sensing system be removed and the brake system be revised as described below.


The whole story:

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You must be registered for see images attach

 

[jwcummings]

Wow thanks for the info