Bringing this thread back from the dead...
I picked up a hydroboost setup out of a chevy Astrovan today. I'm hoping to install it in my 4runner, with a 2lt-II in it. The 2lt series motors have one of those annoying alternators with the vacuum pump mounted on the back, but, my alt. died a couple of years back. Rather than rebuild the 60 amp alternator, I decided to graft on a GM unit. It's a pretty ugly job, but it got the job done. I used a GM 1 wire, cause that's what I had, but part of the reason I wanted to swap to a 'regular' alternator, is the fact that you can get the 3 wire units which can run a tachometer, which my rig, being a conversion, doesn't have (and sourcing the parts to get the original tach system working is proving way hard). And, one last benefit, is that I used the ports for the oil which used to lube the old vacuum unit, to install a bypass oil filter. All in all a handy little set of upgrades.
Right now I'm driving around with a 12v vacuum pump installed to give me my extra braking power, but that thing is loud, and annoying. I mounted it several places, but currently I have it mounted to the rearmost crossmember of the truck, back by the spare tire, just to try and keep the noise down. I don't like it back there though, because I have to run vac. lines all the way up front, as well as running power to the unit - too much wire to get damaged somehow, and having the vacuum back where it could get soaked on a deep water crossing is not cool. So, hydroboost it is.
But, while picking up the hydroboost unit today, I forgot to check which port was for front brakes, and which were for back. It's got two ports for brake lines - the one at the front of the unit is a little bigger - I'm assuming this is for the front brakes, but want to be sure (makes sense, since there are two brake lines for the front wheels, and they do the most stopping - the rear just has the one brake line running to it). Can anyone confirm this for me? Thanks,
Spruce