SlowRob Posted October 21, 2013 Share Posted October 21, 2013 I found a 15/16 master and matching booster from a 280zxt, manual trans, that I'm swapping into my 77. However the pushrod on the zxt booster is offset to the top of the mounting pattern - it comes out above the center of the rectangular mounting bolt pattern - while my setup is offset to the bottom; even the hole in the firewall sits toward the bottom. My question is: Is there any reason not to mount the booster upside down from its original position? I'm fairly familiar with the workings of a booster and can't think of anything prohibitive. I've mocked it up and everything fits perfectly. The larger booster clears the lines and clutch master perfectly. I just have to reverse the orientation of the lines -front to rear. Quote Link to comment Share on other sites More sharing options...
dexter72 Posted October 21, 2013 Share Posted October 21, 2013 I have done this with my 74 260z. 83 280zx brake booster and master cylinder. I just turned the booster upside down and bolted it in. Bolted the zx master cylinder in. Adjusted the booster pushrod to the brake master cylinder. Adjusted the brake pedal rod to the booster. Done. I didn't change the orientation of the lines. I did make up a new brake booster vacuum hose. Quote Link to comment Share on other sites More sharing options...
SlowRob Posted October 21, 2013 Author Share Posted October 21, 2013 In my setup, not switching the lines will cause the front circuit on the master to feed the rear of the car. Is this what you have and it works without issue? Quote Link to comment Share on other sites More sharing options...
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