christoc Posted March 28, 2007 Share Posted March 28, 2007 So I figured something out this evening. The holes in the firewall for my 73, are different than the holes in the parts car, a 78 that is now gone to the junk yard. I was mounting the Clutch MC from the 78 without issue into the 73, then went to install the brake booster, also from the 78, into the 73. Apparently the firewall was changed sometime in possibly 74 (from what I read on here) to facilitate a larger brake booster. Well, here's my question, I just purchased a rebuilt Brake MC for the 78, can I use that on the boost for the 73? Any issues I should watch out for with that setup? Any reason not to run it in that configuration? Stock brakes for now, I'm still worrying about just getting the motor running, then I'll be upgrading other parts as time/$$$ allow. Thanks for your help Quote Link to comment Share on other sites More sharing options...
christoc Posted March 28, 2007 Author Share Posted March 28, 2007 Errr I was going to change the subject, but I apparently can't. Something like, "Can I use a 78 Brake MC on a 73 Brake Booster" would be more appropriate. Quote Link to comment Share on other sites More sharing options...
blueovalz Posted March 28, 2007 Share Posted March 28, 2007 Are you putting a later Z MC onto an early Z booster? If so, yes, this will work. In fact, you can put the early ZX MCs onto the Z boosters. The main issue to look at is the lenth of the pushrod going into the MC. You'll need to ensure it is of the correct length to adequately engage the MC piston. There may be a differnce in this, but I am not certain, and if there is you should be able to adjust it out with the adjustable pushrod coming out of the booster. Quote Link to comment Share on other sites More sharing options...
christoc Posted March 28, 2007 Author Share Posted March 28, 2007 Thanks Blue, I figured it would, but it's always good to get confirmation first Quote Link to comment Share on other sites More sharing options...
spotfitz Posted March 28, 2007 Share Posted March 28, 2007 This may not pertain to your '73. I can't recall. If you are having problems bolting the booster to the firewall and before you go cutting anything, try flipping it over. 180*. I don't recall if the stock vacuum line will reach or if you have to use a ZX vacuum line. I have had several years of boosters in my '74 and '77, including ZX boosters. All bolted right up. As mentioned, the push rod is the tricky part. Quote Link to comment Share on other sites More sharing options...
christoc Posted March 29, 2007 Author Share Posted March 29, 2007 The problem with the 73 is the spacing on the firewall between the Clutch MC and the Brake Booster, on the 78 they two holes are 6" apart, on the 73 they're only 5" apart. We got it all hooked up last night. Quote Link to comment Share on other sites More sharing options...
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