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Thread: JDM RZ rear brake caliper refurb parts - what size is the piston?

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    JDM RZ rear brake caliper refurb parts - what size is the piston?

    Having completed the refurb on my front brakes I've decided that I may as well do the same to the rears.

    I bought in a spare set available to refurb but I'm struggling to find out a definitive on the piston size for the OE rear single pot calipers. Some eBay sellers sell kits for both NA and TT cars, others sell kits only for NA cars. Begs the question, are the jspec NA and TT brakes the same or not? I could just measure the pistons out of the set I have available that were sold to me as full set of genuine jspec TT brake calipers but I'd hate to take the sellers word as one of the front calipers turned out to be non OEM. Armed with the piston dimensions I could confirm the calipers I have are correct for the car ahead of buying in the parts to refurbish them.

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    I'm part of the furniture Authorised Trader Chris Wilson's Avatar
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    I'll try and remember to measure one, I should know but now make a lot for other cars and don't want to give you bum info. I will have plenty of rusty ones if you want one to compare? I also have at least one new stainless one on the shelf...
    Regards, Chris Wilson. No PM's PLEASE, use e-mail!
    Race and performance road car servicing and preparation in north Shropshire. Race and road car engine building and tuning.
    Suspension development and geometry specialist, Supra work and other cars too! 07971-952084
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    If you could confirm the ones on your shelf are 43mm pistons that'd be helpful as that is what I've ordered (still to arrive). I came across sites offering up 41mm and 43mm pistons for the Supra single pot calipers but for some reason, I cannot recall a specific reason, I have taken a punt on the 43mm ones.

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    I'm part of the furniture Authorised Trader Chris Wilson's Avatar
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    43 mm OD is the size of Jap spec rear pistons for the MKIV, just measured one and checked my notes too, cheers.
    Regards, Chris Wilson. No PM's PLEASE, use e-mail!
    Race and performance road car servicing and preparation in north Shropshire. Race and road car engine building and tuning.
    Suspension development and geometry specialist, Supra work and other cars too! 07971-952084
    chris@chriswilson.tv

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    Thanks Chris, nice to know that i plumped for the correct size and hopefully this thread as an archive will aid people buying in the parts as even the non stainless pistons aren't cheap.

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    I'm part of the furniture Authorised Trader Chris Wilson's Avatar
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    People need to be careful with the aftermarket pistons, and I am not just saying this because I sell my stainless steel one... I see plenty that are just gold irridite coated, or a black phosphor finish. This lasts no time at all in an application like a brake caliper piston and I have seen them rust enough to partially seize the caliper within 18 months. If you don't go stainless they MUST be hard chrome plated to a good depth.
    Regards, Chris Wilson. No PM's PLEASE, use e-mail!
    Race and performance road car servicing and preparation in north Shropshire. Race and road car engine building and tuning.
    Suspension development and geometry specialist, Supra work and other cars too! 07971-952084
    chris@chriswilson.tv

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