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Helpful ReplyHot!Late model SW20 brake sizes

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Ant1
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2012/10/07 23:14:32 (permalink)
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Late model SW20 brake sizes

Just wandering what the size differences with the rotors and calipers are between early model SW20 GT and the later model SW20 GT?
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    just_ace
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    Re:Late model SW20 brake sizes 2012/10/07 23:25:06 (permalink) ☄ Helpful
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    early front 258x25 rear 263x16
     
    late front 275x30 rear 280x22
    #2
    Ant1
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    Re:Late model SW20 brake sizes 2012/10/07 23:38:52 (permalink)
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    Thanks.
    #3

    garagista
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    Re:Late model SW20 brake sizes 2013/06/30 19:17:33 (permalink)
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    Hello
    Was just wondering for the above sw20 gt will the later model rotors and calipers bolt straight onto the earlier model?
     
    #4
    kameleon
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    Re:Late model SW20 brake sizes 2013/06/30 21:54:52 (permalink)
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    Yes
    #5
    Reddtarga
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    Re:Late model SW20 brake sizes 2013/07/01 13:06:52 (permalink)
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    Yes they will bolt on, but there are other things that will be affected apart from adding more unsprung weight - pedal travel and pedal pressure needed to stop.
    The '90 model SW20 M/C is 7/8" bore.
    So if fitting later model rotors and calipers, maybe also look at also fitting the later model 15/16" bore M/C to go with them, otherwise your pedal travel may be too great.
     
    But further complications are that along with the larger calipers/rotors, there were booster changes in '92 and '94, and later model ABS systems are also different.
     
     
     
     
     

    1990 ADM NA
    Any advice you get from me may only be worth what you paid for it.
     
     
     
     
     
    #6
    5SGTE
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    Re:Late model SW20 brake sizes 2013/07/01 22:00:58 (permalink)
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    What are the differences to the boosters and how much difference would they make If the master cylinder was upgraded to either the 15/16 or even 1" On the early booster?
    #7
    blacky83
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    Re:Late model SW20 brake sizes 2013/07/01 22:55:23 (permalink)
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    The fronts had twin 36.5mm pistons regardless of year, but the Gen3s were spaced out farther (114.5mm vs 107.9mm) so they had more leverage on the disk. That means greater braking force for the same pedal pressure, which is why they went up with the master cylinder size.
    Rears went up slightly in both piston size and spacing, which kinda counteracts each other. Static front to rear ratio went from 60% Front (Gen2) to 58% Front (Gen3). I'm 99% sure they both use the same proportioning valve, which is pretty close to ideal for street tyres.

    I've got a whole spreadsheet calculating all the ratios and weight transfer, etc, but in the end it pretty much came out that Toyota we're spot on with what they came up with (who'd have guessed :D)
    As for master cylinders, most reports say that with Gen3 brakes, a 7/8" is decent but with longer travel, 15/16" is a good middle ground, and that a 1" gives great feel but with a fair amount of effort.
    #8
    5SGTE
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    Re:Late model SW20 brake sizes 2013/07/02 08:57:15 (permalink)
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    Was more curious about the booster and if the difference was worth the upgrade.
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    kameleon
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    Re:Late model SW20 brake sizes 2013/07/02 23:08:50 (permalink)
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    It definitely is Kris. Try and get as late a booster as you can too, as there were 1-3 revisions of the slimline boosters.
    #10
    Reddtarga
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    Re:Late model SW20 brake sizes 2013/07/03 10:00:41 (permalink)
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    Some JDM '90 models had a fatter booster housing compared to the ADM '90 models that had the 'slimline' housing.
    Boosters were updated in late'91, and 11/93, but both of these look the same as ADM '90 model booster except for the vacuum connection.
     
     
     

    1990 ADM NA
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    #11
    5SGTE
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    Re:Late model SW20 brake sizes 2013/07/03 12:48:35 (permalink)
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    Ok cool thanks guys. So it's a 91 JDM with a fat booster, if I went with a late slim booster I'd need to fluid lines to suit? And I read something about an external valve on the newer items?
    #12
    Reddtarga
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    Re:Late model SW20 brake sizes 2013/07/03 18:55:58 (permalink)
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    Early model boosters had the vac control valve mounted on the booster itself, while later models had them located nearer the motor, with different p/ns for pre and post 11/91 valves.
    Check out Toyodiy for diagrams and p/ns.
     
    I've also noticed that the slimline boosters were changed again after late '97, making 4 different types.

    1990 ADM NA
    Any advice you get from me may only be worth what you paid for it.
     
     
     
     
     
    #13
    artymr2
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    Re:Late model SW20 brake sizes 2013/07/06 15:16:52 (permalink)
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    You will also need to bend the disc shields away a bit to give clearance to the bigger rotors, no biggie.
     
    Current car has the later discs and calipers, and early MC/booster.  Has been like that for years.  I now have the later MC/booster, cant wait to fit them, supposed to make a big difference to pedal feel.
     
    Cheers

    Black SW20 GT Turbo T-top


    #14
    artymr2
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    Re:Late model SW20 brake sizes 2013/07/06 15:18:24 (permalink)
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    Also ABS and non ABS MC are different, I understand the pipe connection location points are changed.
     
    Cheers
     
     

    Black SW20 GT Turbo T-top


    #15
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