cheesepocket Posted December 11, 2012 Share Posted December 11, 2012 I never drove my car with the six for comparison, but if I hook the vacuum line from the booster to the factory tube on the LS1 manifold, I get way too much assist, like stepping on a marshmallow and then way too much braking for the effort. Really tough especially to heel-and-toe that way. I tried leaving the vacuum source capped, but then it's alarming in how much effort it takes, and I feel like I'm gonna put my foot through the thin firewall. I tried getting an industrial valve designed to regulate pressure/vacuum, but all that did is allow full boost for maybe 1.5 pumps and then the booster was depleted. In other words it regulated the volume but not the pressure. I have the stock front disc and rear drum setup stock for my 72 240, and don't want to go down the road right now of the full front/rear and master cylinder upgrade, just want to drive the car for awhile. I doubt I can just mount the master right to the firewall and simply delete the booster, but I don't mind manual brakes if it's easy and relatively cheap. I didn't post this in the brakes section as I am hoping for an LS-specific solution that might still allow me to use the booster. Quote Link to comment Share on other sites More sharing options...
SUNNY Z Posted December 11, 2012 Share Posted December 11, 2012 (edited) I'm running some 4 piston bmw fronts and 240sx rears, and I just hooked it up to the manifold, stock everything else, and it worked great..... Not that that is a lot of help lol. Have you checked instide the booster to make sure the reaction disk is intact? I know this made a big difference for me as far as changing the pedal from an on/off switch to a gradual feel. Edited December 11, 2012 by SUNNY Z Quote Link to comment Share on other sites More sharing options...
Mikelly Posted December 11, 2012 Share Posted December 11, 2012 Yup, my guess is it's in the booster... Mike Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted December 12, 2012 Share Posted December 12, 2012 Dittos. I've got stock brakes and booster and I just hooked a line that had good bends in it from the little valve thingie on the firewall to the vacuum port on the intake manifold. Works like stock brakes. Quote Link to comment Share on other sites More sharing options...
cheesepocket Posted December 12, 2012 Author Share Posted December 12, 2012 Alright thanks all. I've got some 280z parts cars and I'll go rob one of the boosters off one of those. I'll assume, maybe incorrectly, that the booster is the same from 240-280. Pretty painless to try. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted December 12, 2012 Share Posted December 12, 2012 I think I bought my booster from a parts house like Autozone - wasn't that expensive. I think the 280 booster is a lot larger to the point of having some conflicts. Quote Link to comment Share on other sites More sharing options...
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