Hydro-boost questions (looking for data)

Thanks for the post. I have looked at a lot of the kits out there, some are better than others. However since none of those offering kits actually makes the HB unit, rather they are sourcing it from some place else and the fact that there are a variety of HB units available I feel that I can assemble a system for less money than a kit.

To this end, I have no intentions of putting "used" brake parts onto any of my cars, I am not sourcing parts from a junk yard, I will be buying parts from someplace like Rock Auto.

Braking seems to be a bit of a subjective issue; what one guy thinks is good another finds poor. I have a variety of vehicles to include a 70 Challenger RT with a 440 and factory PB (Disc/Drum), 73 Cuda with a 416 that 4 wheel manual disc, an 01 Viper, a 10 Challenger RT, etc. So I have a decent idea of how I want my cars to stop.

In this case, I want to explore a Hydro-boost system mainly because I can and since everyone raves about them I want to see what it is all about. That said, I am very confident I can built a HB system for quite a lot less than $700. Its not about saving money, its about doing something myself instead of paying someone else's markup.

I totally agree with you 70chall440, I've been looking into doing the same thing for one of my B bodies. The "kits" are marked up a bit for sure, but one difference I've noticed is that the kits claim the HB unit to be "brand new" Bosch units versus the Rock Auto units are rebuilt Bosch units. So that may account for SOME of the difference in price plus of course the kits are pretty much "bolt on" versus the "some fabrication required" if you build your own system. But, like you, I'm tempted to give it a try with the rebuilt HB unit.

One question that I haven't been able to fully comprehend is why/how does the HB unit create MORE line pressure with the same M/C installed? I've got plenty of "ASSIST" with my factory vacuum booster, just not enough line pressure for the front discs. I can only come up with the possible answer that the HB unit will easily operate a LARGER bore diameter M/C thereby increasing volume AND pressure to the front discs? Whereas now I have to use the smallest bore diameter M/C (15/16") to generate higher PSI to the front which of course decreases fluid volume at the same time.