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Thread: Good size MC for RX7 brakes?

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    Veteran Jonny Rochester's Avatar
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    Default Good size MC for RX7 brakes?


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    I got the AJPS brake adapters and assembled the kit with RX7 series 4/5 brakes etc... But I put it all on a friends car. I used my calculator and thought the stock MC would be the correct size, 13/16". But after a few days at the track my friend still says the brake pedal is way too soft.

    From experience, what size master cylinder do we think is right for the Mazda 4-spot brakes? Assuming a totaly standard car has normal pedal firmness and travel.

    And maybe running the standard MC with no booster is an option. (Is it legal for roadworthy inspections?)

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    Senior Member wideslider's Avatar
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    I had R32 4 pots with a disc rear end and had a Mitsubishi FTO master on it.
    It was a 15/16 bore and gave a good pedal.

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    Senior Member Hen may possibly be a nut's Avatar
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    When I ran FC calipers I used a 15/16" master (and otherwise totally stock braking system, including rear drums). This felt fine too me, but I'm not the pickiest driver around.

    Hen

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    Senior Member Matt-AE86's Avatar
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    Nissan R32 NA Master Cylinder (Non Abs)

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    Skid Kid
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    with booster, Starion 1inch

    without booster, stock master

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    Senior Member Oly AE86's Avatar
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    I run the RX7 S4 calipers and use the R32 4 Door non-abs master. Definately firmer than the std AE86 item, but doesn't feel to stiff. I believe its 15/16 size, still using the std booster.

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    Got a feeling the r32 non-abs might be 7/8ths. So just a step up from 13/16ths.
    I might be getting confused with the mirage master though...........will confirm (it's sitting in the shed).

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    Veteran Vance's Avatar
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    i hear a mitsu pajero mc is the way to go. bolts up to the standard booster and isnt too long etc.

    havent had any experience with it myself but its what JHS said to use in the FAQ. the part number on the FAQ is for the correct pajero mc to use. may aswell buy a brand new one


    Quote Originally Posted by ae86 View Post
    ive come to the conclusion dan has more STi's than a Subaru Dealership, yeah i went there

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    Senior Member Roo.'s Avatar
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    yea i have the pajero master cylinder, got hilux brakes at the front and standard rear disk seems nice and firm pedal but i haven't done any hard braking yet

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    Quote Originally Posted by Matt-AE86 View Post
    Nissan R32 NA Master Cylinder (Non Abs)
    +1

    I have one on my car, improved pedal feel greatly, and bolts straight up.

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