[Tom]

Originally Posted by Red88

Sorry if my explanation wasn't straight forward enough. In my truck the old master had a spongy pedal which also means it didn't stop very well. The NBS master had a much firmer pedal but I really had to stomp on the brakes to stop. Adding the dual diaphram booster gave me both a firm pedal and the stopping power I was looking for.

I think I get what your saying now

There were 3 different brake options on 1/2 ton trucks. Good-better-best. Good wasn't very good IMHO.

So I've been researching this today as I'm bored at work. Going by rockauto's pictures, 98's came with JB5,6,7 and 8 brake systems. They all used either the 10.5" dual diaphram or they used hydroboost. I'm guessing the other styles might be earlier setups? I know a couple people who put NBS masters on vortec 1/2ton trucks and had no complaints about pedal effort so I'm assuming they all had the 10.5" from the factory....