ussbhr Posted December 24, 2006 Share Posted December 24, 2006 i got 73 240z i swap to toyota 4x4 caliper for the front and rear disc convertion and swap to 82 zx MC after all the installation and bleed the brake , no air present however the brake is very weak and once turn on the engine ,it wont feel like any feed back at all may be the booster went bad or i just install everything wrong? Quote Link to comment Share on other sites More sharing options...
roninjiro Posted December 24, 2006 Share Posted December 24, 2006 sounds like you either left a bleed valve open, or you master cylinder is bad Quote Link to comment Share on other sites More sharing options...
ussbhr Posted December 24, 2006 Author Share Posted December 24, 2006 i m pretty sure there isn't leak anywhere and the Mc brand new i can still feel a little pressure from the pedal with the engine turn off i m about to change the booster.... Quote Link to comment Share on other sites More sharing options...
EMWHYR0HEN Posted December 24, 2006 Share Posted December 24, 2006 If you say it was properly bled up to that point it seems like you did everything right. I'm pretty sure the problem your having has been discussed already. Search around. From what it sounds like though, maybe a vac. problem or booster. Quote Link to comment Share on other sites More sharing options...
Sam280Z Posted December 24, 2006 Share Posted December 24, 2006 make sure your bleeder screws on the calipers are on on the top. If not switch sides. Sam Quote Link to comment Share on other sites More sharing options...
mom'sZ Posted December 24, 2006 Share Posted December 24, 2006 Well I just want to point out here on the forum we've had numerous instances where guys have been going nuts trying to diagnois brake problems that in the end turned out to be defective master cylinders that were brand new. It's the last thing everybody checks because it's brand new and assumed to be good. The booster is also rebuildable if you feel like doing it yourself, search for a thread on how. PS: don't mean to point out the obvious, but you did bleed the master before installing it right? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted December 24, 2006 Share Posted December 24, 2006 Search for REACTION DISK or REACTION DISC. Many threads on the subject, its a little rubber disk about the size of a nickel. If it falls out the pedal feels like there is nothing there when the car is running. Kinda sounds like your problem, huh??? I think that is probably most of the issue. The other is likely candidate is properly adjusting the pushrod length between the booster and the back of the master properly. If those two things are OK, then I'd look at the master cylinder itself. Quote Link to comment Share on other sites More sharing options...
ussbhr Posted December 24, 2006 Author Share Posted December 24, 2006 i searched the forum i just want more opinion tks for the input Quote Link to comment Share on other sites More sharing options...
GrommitZ Posted December 24, 2006 Share Posted December 24, 2006 I second Jon's guess on the reaction disc. It wasn't very clear to me what problem you had, but it sounds like the pedal has very little resistance with the engine turned on. Does the pedal have little resistance and then come to an abrupt halt? If so, I think it is the reaction disc/disk also. Searching the forum will show you how to fish out the reaction disc from your booster. Quote Link to comment Share on other sites More sharing options...
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