71 Charger Superbee Tribute/Restomod Build

[70chall440]

Most of them seem to do it it looks like the higher the psi & pump flow rate the less the issue .
I have tried drilling the return close to thread size with little effect on pedal return rate & why would the manufacturer supply with a certain size orifice only to have them drilled out.
The HB uses flow rate & pressure to return the pedal so by drilling out the return you are increasing the flow rate through the circuit They have a restriction in the return to stop air forming inside of the HB unit ,I notice a lot of people in the US use a large spring to return the pedal there is also a return spring between the master cylinder & hydroboost to assist pedal return which i have increased without effect . I have never had a problem getting parts its just the time & cost it takes to ship to Australia my mate goes to LA every few months & brings back a container load of usable old & newparts . I just have to make sure the pressure is not increased to the point that it damages the Borgensen box.

Gotcha.

Just for the record I am not advocating or suggesting one thing over the other, I have no basis of reference or experience other than installing 2 HB systems (one on the RR that is currently in Brisbane and the other on this Charger which isn't running yet).

I have not researched this but I have to think of it like this; obviously HB systems work as they are found on my vehicles so the question then is what is different between an OEM application and what we are trying to do on these conversions? I'd agree that would be the use of a different pump and box primarily but as noted some systems/builds do not have this problem so then why does theirs work?

I cannot say for certain but adding a large return spring under the dash seems to be a work around (not saying I would/will not resort to that). There has to be an explanation and thus a fix.

Perhaps it has to do with the HB unit itself?