Quote:
Originally Posted by 68bowtie
...my truck was factory a/c big block with manual drum/drum brakes. i would think manual disc/drum would be better (with a correctly designed system)...
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Understand your truck didn't have a booster originally. The J70 booster was not required at the time with any specific option during the 68 MY that I can find. However many were dealer installed with a simple GM kit.
However I would simply like to point out that the 71-72 power disc requirements were GM blanket to meet then design and performance standards.
Some people may find the unboosted performance acceptable even with a heavy or forward bias option load. However one would have to ask, does the entire family of drivers feel the same and will they be as safe?
Finally there is a mechanical advantage inherent with the drum brake design that increases their effectiveness that disc brakes do not have. They are simply fixed ratio hydraulic clamps.