Disc in front drums in back you definitely need a prop valve.
Steve
Hey Steve, thanks for responding. I am curious. I just can't get a straight answer, some say yes I need one, and some say I don't need to run one. The car seems to be stoping just fine. I haven't had a chance to lock up the tires and see which ones lock up first.
1. You definitely need to do a lockup test under normal conditions ( but not in traffic of course) first.
2. I just reviewed a recent lengthy HP Brake book, the author numerous times states using the factory valve as best choice, but he never relates that statement as to what mods would negate that choice, like changing to a big block (weight balance), tire size/compound changes, suspendion changes, pad compound changes, etc That suprised me.
3. He was emphatic that two valves in series should never be used.
4. IMO for a street driven modified brake system car driven slightly aggressively, an adjustable valve controlled from drivers seated position is required, and I see little reason to omit this
5. Design balancing of the system is the most important and first step according to the author, and an adj valve only for fine tuning, and they only control approx 59%.
6. I always thought a balance bar system was ideal, he says no, a valve is better since it is NOT linear in applying pressute, and says that is an advantage, and he backs it with graphs, etc
7. So my answer, install an adj brake valve.
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