I'm having no joy elsewhere, and before i take my MU to a brake specialist I thought i'd ask here.
Problem is my brake pedal is building up too much pressure. I have a basic understanding of the vacuum requirement, so if i had to guess, i'd say pressure keeps building up and however it is released is failing. at start up the brakes are normal, but the longer i drive (and presumably, the more i'm on and off the pedal), the brake pedal hardens up to the point that i only need apply a few mm of movement to the pedal to achieve full brake. i also feel that the brakes may be riding slightly at this stage as well, as zippiness is gone, feels like i'm driving up 45 incline. (reference: like driving up to high range in townsville)
the MU came with a few mods when i got it, i bought MU wholesale, so i never spoke to the previous owner. could he have been in the middle of a mod? the brake booster looks brand new, the EGR was already gone and I've since ditched the vacuum hose bird nest. at the moment, being the dodgy DIYer that i am, i've tapped retic into the vacuum hose at the brake booster and run it into the cabin with an adjustable drip head which i ended up leaving wide open constantly. dodge setup helps slightly, but the 4mm hose doesn't let it out at quite the same speed vacuum builds up.
i would love to just tap a vacuum regulator into the line, it sounds simple in theory, but i can't even find a guage that registers negative pressure (plenty of adjustable positive pressure regulators, and no you can't just put them on backwards) and then i would need to monkey with it to find the right point to release vacuum.
whew there you go, any help or should i go ahead and book a pro? hopefully one of you loves puzzles personally, i've fried my brain thinking about it