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Thread: Early Brake Master Cylinder

  1. #1
    Registered User psdenno's Avatar
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    Default Early Brake Master Cylinder

    I searched the message archive and think I know the answer, but need validation before I talk to my mechanic tomorrow.

    My Z has a 4/71 build date. I bought it NEW, however it's been sitting for years and I had all the brakes replaced - including the M/C. My mechanic used a later M/C. I've read that the reservoirs are switched on late '71 M/Cs and the lines to front & rear brakes need to be rerouted if going from an early to late M/C. Is that correct? Input appreciated.

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    Semi-retired admin Arne's Avatar
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    Yup. I've got two early cars now, one with the proper cylinder and one with the later cylinder. The later cylinder does require the lines to be swapped at the master cylinder.

    My red car was in the exact same boat as yours when I bought it. The previous owner had a shop replace the master cylinder and they used the later one without swapping the lines. It worked, but the brake balance wasn't right. I bought the correct cylinder from Nissan to correct the issue. The 'wrong' cylinder went on my other car (which will never be more than a nice driver, at best) with the lines reversed.
    Arne - Former owner, HLS30-37705, 7/71, 905 Red
    Car blogs - 240Z - Porsche 911

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    Yeah I had to do same thing....Because my car is not worth the $250.00 or so for the "correct one"....Just make sure the new M/C is a 7/8" bore and move the lines...

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    Registered User psdenno's Avatar
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    Thanks for the input guys - my mechanic has made the line switch and mounted the new wheels & tires. A few more things to check and I'll be on the road next week. Getting the Z roadworthy after 15 years in storage has now cost just a bit more than I paid for it NEW in 1971. Oh well.

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    Biafra for President e_racer1999's Avatar
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    quick q in addition to this - does this apply to ALL 240zs? because i was going to swap in a 15/16" master from a ZX. do i have to replace all the lines to get proper balance? if that's the case, does anyone wanna buy a ZX MC? :P
    Jason King
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    Quote Originally Posted by xray View Post
    As unfortunate as it may be, if you want to vintage race, go Euro....If you want to race for real, stick with the Z!

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    Semi-retired admin Arne's Avatar
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    No, Jason. Just the '70 and '71 240Z's have the odd early master cylinder. Your late '72 has the later cylinder with the front brakes supplied by the rear reservoir. I believe that is the same as the ZX cylinder, and you shouldn't have to reverse the lines.
    Arne - Former owner, HLS30-37705, 7/71, 905 Red
    Car blogs - 240Z - Porsche 911

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    Biafra for President e_racer1999's Avatar
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    thanks arne, you're a lifesaver
    Jason King
    6/72 240Z / HLS30 89646 (Yellow)
    1996 Infiniti I30 *I finally have all Nissans again!*
    1971 510 4door (wife's car)
    IZCC Member #14186

    Quote Originally Posted by xray View Post
    As unfortunate as it may be, if you want to vintage race, go Euro....If you want to race for real, stick with the Z!

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    Supporting Member =Enigma='s Avatar
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    Quote Originally Posted by Arne View Post
    No, Jason. Just the '70 and '71 240Z's have the odd early master cylinder. Your late '72 has the later cylinder with the front brakes supplied by the rear reservoir. I believe that is the same as the ZX cylinder, and you shouldn't have to reverse the lines.
    It's the same with the 73. I was able to mount up the ZX MC without making any changes to the lines.
    =Enigma=
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    Registered User vercingetorix's Avatar
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    Is it possible to identify which cykinder is already in my car? I know that it has been changed,how do I identify if it is the proper cylinder? My car is an early 71.
    Just curious.
    H Houghton

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    Front reservoir is in the front and marked front, rear is marked rear and is marked as such......BTW the front is bigger than the back....It's for the disc brakes...

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    Registered User vercingetorix's Avatar
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    Thanks,thats exactly the info I needed,I'll take a look in the morning.

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    Registered User FilipeA's Avatar
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    Hi

    I have also an early 1971 240z, and bought a M/C from late 71 to 73, and nottest that the reseivor and diferrent the big one is at second place now,so the only thing that I have to do is swap the brake lines the front to rear and vice-versa?

    I bought mine on Ebay, it`s from bendix unit, do you think it will works good, because I read another posts and said that will not work properly.

    Thank You

    Filipe Azevedo

    Thank You

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