the_journeyman Posted October 19, 2011 Share Posted October 19, 2011 1978 280Z. Stock front discs & rear drums. NOT warped rotors, you can feel the pulsing while completely stopped at idle. Varies with engine speed. So, I've been going through little by little replacing "suspect" parts. My brakes seemed very soft through about half-travel then gave good resistance from there. Car stopped fine, could lock brakes even. Due to the fact there were four pieces of line, a pressure (why, no idea, didn't read anything) gauge making up my brake vacuum line, I thought it was worthy of replacing. Vacuum line ran from the rear-most intake tract to the MC, new line follows same path. Now, I can feel distinct intake pulses from the intact tract in the pedal. Feel is more linear than before throughout pedal travel. Am I supposed to feel the intake pulses? Should the vacuum line pull from more than just the one intake tract to smooth out feel? Thanks for the input folks! JM Quote Link to comment Share on other sites More sharing options...
Drax240z Posted October 19, 2011 Share Posted October 19, 2011 Was there was a check valve in the old system? Quote Link to comment Share on other sites More sharing options...
the_journeyman Posted October 19, 2011 Author Share Posted October 19, 2011 Was there was a check valve in the old system? Didn't appear to be, UNLESS the pressure gauge (with on/off adjustment knob like on a air regulator) was providing a check valve. Other than that, there was nothing special in any of the lines, just male-male connectors. It would be easy enough to cut the new line and put the pressure gauge back in. JM Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted October 19, 2011 Share Posted October 19, 2011 Install the check valve that is supposed to be there. Make sure you face it to allow flow towards the engine. Quote Link to comment Share on other sites More sharing options...
LanceVance Posted October 19, 2011 Share Posted October 19, 2011 Sure the male/male connector isn't your check valve? It's a pretty simple looking part... Quote Link to comment Share on other sites More sharing options...
the_journeyman Posted October 19, 2011 Author Share Posted October 19, 2011 Install the check valve that is supposed to be there. Make sure you face it to allow flow towards the engine. Sure the male/male connector isn't your check valve? It's a pretty simple looking part... Nope, didn't really look any of it over. When I get home this afternoon I'll look over the old stuff and find which was a check valve. I'll reinstall that piece and it sounds like that'll fix the problem. Thanks for the help folks, I'll update with the results later this evening. JM Quote Link to comment Share on other sites More sharing options...
the_journeyman Posted October 19, 2011 Author Share Posted October 19, 2011 (edited) Sure enough, I had taken a check valve out. That's going back in tonight! Thanks for the help! Drove to work today, pulse was gone. Thanks for the help! JM Edited October 20, 2011 by the_journeyman Quote Link to comment Share on other sites More sharing options...
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