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I have an '86 F-250 4wd I am looking for the part number of rear brake line Load sensing valve.
It mounts to the frame above the rear axle. It has a splined shaft where a arm link attaches to the axle. I suppose this valve increases braking power when heavily loaded. Also limits rear wheel lck up when empty.
I think ftepartsguy.com may have it for $149.80. I plugged in your truck, selected brakes-hydraulics-pressure metering valve. You may want to call them to make sure that's the correct piece. Hopefully that's not the proportioning valve up front.