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Thread: twin piston caliper options.

  1. #1
    busy adding lightness Too Much Toyota MR22ZZ's Avatar
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    Default twin piston caliper options.

    I was wondering if anyone was aware of any bolt-on brake caliper options that would fit 275x25mm discs.

    It appears that the Celica ones I was hoping for may require some modification to fit, and the particular model is hard to find so looking at other options.

    Cheers
    Last edited by MR22ZZ; 13-09-2006 at 03:00 PM. Reason: typo...

  2. #2
    Current UZA80 owner Chief Engine Builder JustCallMeOrlando's Avatar
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    Default Re: twin piston caliper options.

    Man I ask why twin?
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  3. #3
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: twin piston caliper options.

    maybe rim clearance?

    55mm?

    as for similar sized disks... maybe R32/300ZX (280mm) or celica ST202 perhaps?
    "I'm a Teaspoon, not a mechanic"
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  4. #4
    busy adding lightness Too Much Toyota MR22ZZ's Avatar
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    Default Re: twin piston caliper options.

    The stock calipers are single pistons and looking for an increased piston area / clamp pressure. If you know of a 4 piston alternative that would be even better... overkill, but better. And yes, needs to fit under 16-17 inch rims (16 pref)

  5. #5
    busy adding lightness Too Much Toyota MR22ZZ's Avatar
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    Default Re: twin piston caliper options.

    Quote Originally Posted by oldcorollas
    55mm?
    yes that appears to be the stumbling block. I can find 277x28mm Celica ones. Not sure if they will bolt on though without much modification.

  6. #6
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: twin piston caliper options.

    ahh

    opposed twin will be no better for clamping force than a single slider.
    a twin slider has a relatively fixed disk width, because it's hard to alter the width of the sliding part.

    and most disks are less than 30mm in thickness.... 55mm is huge!!!

    i suppose the only way would be to get a 4 pot, or two pot opposed caliper, then make a 20-30mm spacer for the middle, and use longer bolts?

    if i may ask, what vehicle has a 55mm thickness brake disc? must weigh a ton!

    any possibilities of using thinner discs? like 30mm?
    "I'm a Teaspoon, not a mechanic"
    "There is hardly anything in the world that a man can not make a little worse and sell a little cheaper" - John Ruskin (1819 - 1900)

    AU$TRALIA... come and stay and PAY and PAY!!! The moral high horse of the world!

  7. #7
    Current UZA80 owner Chief Engine Builder JustCallMeOrlando's Avatar
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    Default Re: twin piston caliper options.

    Are you sure it's 55mm and not 25mm or something?
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  8. #8
    busy adding lightness Too Much Toyota MR22ZZ's Avatar
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    Default Re: twin piston caliper options.

    typo... I meant 25mm

  9. #9
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: twin piston caliper options.

    going by here http://toymods.net/forums/showthread...=st202+caliper

    St202/204 is 277x25 anyway and twin piston?
    "I'm a Teaspoon, not a mechanic"
    "There is hardly anything in the world that a man can not make a little worse and sell a little cheaper" - John Ruskin (1819 - 1900)

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  10. #10
    Junior Member Too Much Toyota YLD-16L's Avatar
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    Default Re: twin piston caliper options.

    Git farked!!! I just wrote a whole heap of great info and then was required to re-log-on and lost it all but in summary

    Your disc is:

    255mm diameter
    49.5mm height
    25mm disc thickness
    55mm centre hole
    4 bolt (4x100PCD)

    The ZZT231 Celica uses:

    275mm diameter
    49.5mm height
    25mm disc thickness
    55mm centre hole
    5 bolt (5x100PCD)

    Redrill this disc and it would be a factory fit. Perhaps the calipers from the same celica may be a bolt on option?? Worth looking into!

    Measure the bolt spacing on your caliper (mounting bolts) and that will let us tell you what other calipers may bolt on.
    My KE25 thread
    WSID - 12.8@108mph || Wakefield Park - 1:11.4 || SDMA Hillclimb - 49.1

  11. #11
    busy adding lightness Too Much Toyota MR22ZZ's Avatar
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    Default Re: twin piston caliper options.

    I have a ZZE-123R, not a ZZE122

    Discs are the same as the Celica ones just 4x100PCD, and the ZZT231 Celica calipers are single piston as far as I am aware.

    I'll measure the bolts tonight

    I'm thinking the ST202 may be the way to go
    Last edited by MR22ZZ; 13-09-2006 at 03:25 PM.

  12. #12
    Junior Member Too Much Toyota RONA's Avatar
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    Default Re: twin piston caliper options.

    YLD-16L FYI you can press back your post will still be typed, copy, re login, paste and voila no lost info
    If in doubt power out

  13. #13
    Former User Conversion King Joshstix's Avatar
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    Default Re: twin piston caliper options.

    I'd be surprised if you saw a whorthwhile increase in braking performance just by increasing the piston count/area of the front calipers on the same size rotor.

    If you want a good improvement it's time to either get a larger diameter disk or pads with a higher coefficient of friction.

    This is under the assumption that the stock calipers are not total rubbish and operate as good as a basic single piston caliper ought to.

  14. #14
    busy adding lightness Too Much Toyota MR22ZZ's Avatar
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    Default Re: twin piston caliper options.

    The thing I notice about the standard brakes is the area of the pad relative to the piston. It seems to have a large surface area for a single piston caliper setup so I worry about the evenness of the clamping force. Wouldn't changing to a twin piston setup even out the pressure applied to the pad?

  15. #15
    Junior Member Too Much Toyota YLD-16L's Avatar
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    Default Re: twin piston caliper options.

    Quote Originally Posted by Rona
    YLD-16L FYI you can press back your post will still be typed, copy, re login, paste and voila no lost info
    I did that and it came up with the text box blank

    Quote Originally Posted by Joshstix
    I'd be surprised if you saw a whorthwhile increase in braking performance just by increasing the piston count/area of the front calipers on the same size rotor.
    True, the guys who change from the sinle piston calipers on their ST162s to the twin ST165 calipers often say the difference is not noticeable.

    Quote Originally Posted by Blue_Stivo
    I have a ZZE-123R, not a ZZE122
    Ahhh my bad, so you have 275mm discs already.

    I would be wary of just changing the caliper from what you have to the ST202 caliper then, as you will fitting an older caliper and most likely not making any gains, unless of course the swap is also to a larger diameter disc.

    What is the pad size like on the ST202 caliper compared to what you have now?
    My KE25 thread
    WSID - 12.8@108mph || Wakefield Park - 1:11.4 || SDMA Hillclimb - 49.1

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