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Re: 79' K20 with 1-Ton rear brakes from factory??
1 ton brakes are JB8 and are hydroboost.
There are a few things that I could see happening.
1) Maybe it was ordered that way. These trucks seemed to be nearly completely customizable from the factory.
2) Someone swapped the rear axle with one from a 1 ton truck. The spring perches would have to be moved (I think the shocks have different mounting locations on 3/4 vs 1 ton as well.) to fit on a 3/4 ton truck.
3) Someone may have upgraded to jb8 rear brakes. I suspect this could be easily done by swapping the entire axle backing plate setup along with shoes and drums and wheel cylinders. I would think there would be brake proportioning valve and master cyl differences as well which if not have been done would cause the rear brakes to lock up well before the fronts.
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