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View Full Version : Legalities/Advice of Dual Circuit in EH


JabberWocky
27-10-04, 06:15 PM
At the moment, I'm running a dual circuit system on my EH through a HZ master cylinder. The front line runs through a VH40L remote booster than joined by custom lines to the original front circuit. The rears (Volvo disc brake) run straight from the master, through a custom line and into the original rear circuit.
Now, I'm going to put a rack and pinion kit in my car and as such will need it engineered. Whilst doing so I am quite sure I will get a knock back on my brakes as it has been done properly and is entirely safe, but it is not legal.
To make it legal, and to finish the car off as a whole, I am pretty sure that I have to run dual boosters (is 2 VH40Ls ok?) and the proportioning valve with low pressure switch (have this from when I got the master of the HZ).

As such I will need to run master -> switch/pvalve->individual boosters->back into front and back circuits.

Pretty sure the switch has to be before either circuit is boosted to give equal pressure?? Decided on current system with local brake dude about 18 months ago as my booster wasnt working when it was still single circuit and rears werent locking (ie with equal pressure front and back). By putting in the PValve I thought I wouldnt be getting enough braking to the back end and would just be braking with the front. I'm pretty sure that is the case now however as the forn is boostered but the back isnt. I drew a two roughies of before and after to give you idea of what I want to do. I have a fair idea of where I will run the lines (not shown exactly in drawings) and have looked at a few ehs but any advice would be appreciated.
Cheers
Grant

P.S. Anybody got a cheap VH40L booster they dont need in Sydney :D

dattoman1000
27-10-04, 08:41 PM
Speak to your engineer first....he can test it to see what your front/rear balance is if he has the right equiptment.
Sounds like your package is reasonable now and might not need the rears boosted
If you do boost the rears you'd want to go with a VH44 for a lower power multiplication and leave the fronts as they are.
You would probably be best to put an inline prop valve into the stsyem if you do boost all 4 wheels though. This will give you adjustability incase you "overboost" them.
If you do fit a switch block yes it will have to be between master and boosters.