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Re: 69 3/4 ton power drum brakes pro valve pic request
I dont think there is any diff between power and non power. That block basicly splits the front and rear and houses the warning light switch. The four wheel drum brakes do not use a proportioning valve. I think thats how it works. Even the disc trucks use the same prop valve between 1/2 and 3/4 ton. They are just plumbed different. If yours looks like GMCBubba you should be good to go.
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