Aluminium 4-pot Brake Callipers - Page 2
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    I'm a grown up member now ! Wolselliac's Avatar
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    WB54. Sounds interesting, what are the piston diameters?, and the disc sizes eg. overall dia and width (not that I will be using them, but to see if they will fit my discs).

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    A friend of mine has an SD1 track car abandoned in her barn, it raced at every track in Britain in the 90's in the TOYO tyres series, we put Princess calipers on that and worked great, thing is I dont know if you can still buy them now.

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    Quote Originally Posted by 68roadrunner View Post
    A friend of mine has an SD1 track car abandoned in her barn, it raced at every track in Britain in the 90's in the TOYO tyres series, we put Princess calipers on that and worked great, thing is I dont know if you can still buy them now.
    sure can https://www.ebay.co.uk/sch/i.html?_f...rt=nc&_udlo=56
    need a job done on your project? i may be able to help.

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    I'm a grown up member now ! Wolselliac's Avatar
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    68roadrunner. The Princess callipers have 38mm dia pistons (compared with the SD1 calliper pistons of 41mm dia) which will give less mechanical leverage (less clamping pressure), so not really big enough for my car. It would be interesting to know if your friend used green stuff or yellow brake pads.

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    Official RnS Addict Magman's Avatar
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    Quote Originally Posted by nobody View Post

    if youre going to mod calipers,send them off to bigg red for refurb.they will just do the ones you send in.
    once done,chances are youre never need to redo them
    I’ve just watched these guys on an episode of Car SOS, they were rebuilding Porsche callipers. As much as you can tell on the telly box they do appear to be good at what they do and don’t look like a fly by night operation.

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    Official RnS Addict WB54's Avatar
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    Quote Originally Posted by Wolselliac View Post
    WB54. Sounds interesting, what are the piston diameters?, and the disc sizes eg. overall dia and width (not that I will be using them, but to see if they will fit my discs).
    sorry just seen this, not sure on piston size but they work on a 305mm disc/ 28mm disc. I have the equivalent ones from an Alfa on my Capri, only switch to those as the mounting brackets were better spaced for the Capri leg.

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    Administrator blackpopracing's Avatar
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    Dont get hung up on piston size/clamping force - it's more complicated than that. If you fit calipers with bigger pistons but dont also change outr the M/C to match you will end up with poorer brakes.

    You would be better off looking at your M/C and also your servo. Altering the brake pedal pivot point can also make a difference.

    You could probably just swap out to vented discs & calipers which you already have and then either fit a bigger servo or look at decreasing the bore size of the M/C (which will increase line pressure at the cost of a (slightly) longer pedal travel). It's all about the clamping force on the pads from the MC first (1100 Psi is where you are aiming for), fitting larger diameter discs with the same calipers will also increase braking efficiency.

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