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Thread: Escort master cylinders

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    Tyre Kicker larrythelabrador's Avatar

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    Escort master cylinders

    Hi, Bit of advice please:
    What size master cylinders are recommended for following:

    MK2 Escort Tarmac rally car
    13" wheels
    AP Monte Carlo 4 posts at front CP2270
    AP CP2382 2 pot vented rears

    Dual circuit pedal box

    Thanks

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    Re: Escort master cylinders

    welcome to the mine field! get ready for 26 different answers, the trouble is personal preference also comes into it, some like a really solid pedal with little movement, other prefer more movement and more feel.

    the usual starting point would be 0.6 front 0.7 rear
    Last edited by Graham; 30-12-2021 at 18:02.

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    Racer Forest_rallying's Avatar

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    Re: Escort master cylinders

    Quote Originally Posted by Graham View Post
    welcome to the mine field! get ready for 26 different answers, the trouble is personal preference also comes into it, some like a really solid pedal with little movement, other prefer more movement and more feel.

    the usual starting point would be 0.6 front 0.7 rear
    That would be my starting point too. You might also possibly need an inline bias valve for the rear brakes to stop them locking up.
    Getting an ideal setting with a bias pedal box is a minefield and often takes many attempts to get to your liking. You probably won't even know it they are right until the brake pads get up to working temperature on an event.
    Last edited by Forest_rallying; 30-12-2021 at 21:16.

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    Tyre Kicker larrythelabrador's Avatar

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    Re: Escort master cylinders

    Thanks, Mine has .7 in front & rear & I'm struggling to get enough to the front.
    Will try a .6 in front.

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    Racer

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    Re: Escort master cylinders

    Simple rule small number = higher pressure but lower volume moved & larger number = lower pressure but higher volume moved.
    The difficulties occur in matching this simple rule to the slave cylinder diameter or caliper piston areas as there is no set rule for this due to pedal force differences, pedal feel, weight of vehicle and overall brake efficiency. BTW 0.6" isn't a commonly available size, that would be 0.625" and then 0.5" (rarer). Going larger sizes are 0.75" and 0.875" (rarer). Throw servo assistance into the mix and everything goes out the window as regards feel and pressure BUT a servo won't make bad brakes or poorly selected cylinders, better - just softer to operate!

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    Tyre Kicker larrythelabrador's Avatar

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    Re: Escort master cylinders

    Quote Originally Posted by katana View Post
    Simple rule small number = higher pressure but lower volume moved & larger number = lower pressure but higher volume moved.
    The difficulties occur in matching this simple rule to the slave cylinder diameter or caliper piston areas as there is no set rule for this due to pedal force differences, pedal feel, weight of vehicle and overall brake efficiency. BTW 0.6" isn't a commonly available size, that would be 0.625" and then 0.5" (rarer). Going larger sizes are 0.75" and 0.875" (rarer). Throw servo assistance into the mix and everything goes out the window as regards feel and pressure BUT a servo won't make bad brakes or poorly selected cylinders, better - just softer to operate!
    Ordered a .625, will give that a try after setting up the balance bar, it's currently got about 1/4" side to side movement as well!

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    Re: Escort master cylinders

    Quote Originally Posted by larrythelabrador View Post
    Ordered a .625, will give that a try after setting up the balance bar, it's currently got about 1/4" side to side movement as well!
    side to side movement is normal.

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