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Thread: Master cylinder question for AE86

  1. #31
    Senior Member Stain's Avatar
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    As far as I know the nissan masters have the proportioning built in, which is why the nissan boys fret so much about which BM to get when they upgrade front/rear brakes.

    I've upgraded to R32 Skyline 4pot fronts with a 280x22 rotor and RT142 Corona 1pot rears with a 269x10 rotor.

    With the standard AE86 brake master and ADM proportioning valve the pedal was very soft until about half way where it would grab and pull you up nicely. But if you were too violent the fronts would lock.

    Now I've just installed the R33 GTS-T non-abs BM44 on the standard AE86 booster and removed the proportioning valve... I'll let you guys know how it feels.

  2. #32
    Senior Member Simon-KE70's Avatar
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    not all nissans have prop valve built in, the later ones do but s13 and r32 ones dont i believe, they have a small little valve about half way down the firewall towards the rear of the car

  3. #33
    Veteran Jonny Rochester's Avatar
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    The kouki AE86 master cylinder has two sets of holes, so it can still bolt to your old booster.

  4. #34
    Veteran LittleRedSpirit's Avatar
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    Thanks for the reply. I'm wanting to run a ke55 booster, which has an angled stud pattern for the master and the same 4 bolt pattern as the ae71 on the other side. It just happens to be close to 2 inches smaller in overall diameter, making more room for velocity stacks and such luxuries. I really just want to know which way the studs are angled and what spacing thay are at to compare to my 55 booster. Might be able to run uncut 100mm stacks if all goes well and the kouki master cylinder fits the ke55 booster.

  5. #35
    Veteran Jonny Rochester's Avatar
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    Also consider a 1977 KE30 booster, as that has the same bolt spacing as AE86.

  6. #36
    Senior Member Simon-KE70's Avatar
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    R33 master fits and works perfectally, has built in proportioning valve on the rear line and is small and compact unlike the 32 one. There are two types tho but the right one to get has F and R on the body of it, where as the other one (ABS item) has S and P cast on it. no prizes for guessing what F and R stand for either....


  7. #37
    Moderator Sam-Q's Avatar
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    LittleRedSpirit: I have heard someone talk about stock axles bending due to their small diameter, any thoughts?

    maxhag: can I suggest you take your car to a local weigh-bridge? the result may suprise you
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  8. #38
    Veteran LittleRedSpirit's Avatar
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    Can you be more specific please Sam. Stock what axles? Small diameter?

  9. #39
    Senior Member sr_rolla's Avatar
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    i think he means stock ae86 stub axles

  10. #40
    Veteran LittleRedSpirit's Avatar
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    Well, some people bend them to get them at a more appropriate angle and to equalize camber. I think when this happens its more likely the struts are bending than the stub axles. My mechanic has a jig to do it.

    As far as big brakes having an effect on the stub axles, I'm not too sure. I personally haven't had my brakes in for long enough to check mine out. I'm more concerned that the bearings will deteriorate and the flimsy pressed steel caliper brackets will distort and cause uneven pad wear. My brakes make a kind of bizarre friction noise when they stop as hard as possible, there's definately some powerful forces there.

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