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    Master cylinder bore size
    #1
    Senior Member
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    Coon Rapids, MN
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    Hi guys. I still can't figure out what bore size I need for my master cylinders. I have two twin piston calipers in front that are 1" pistons from a 450R. In the back I have the popular wilwood that has two pistons that are 1-3/4" pistons. I can't find any information on how to figure this out.
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    Re: Master cylinder bore size
    #2
    Senior Member RDRacing647's Avatar
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    Apr 2011
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    Southern Highlands NSW Australia
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    G'Day Trav,

    For what it's worth...

    I asked this very same question to a brake specialist, who provided this response ' 3/4'' bore in your M/Cylinders would be better. Using 5/8'' bore you will have more pressure less volume & a lower pedal depending on roll-back in the calipers ', I went with two 3/4" bore M/Cylinders one for the front caliper & one for the rear caliper.

    cheers
    Chris
    "Straight roads are for fast cars, turns are for fast drivers." - Colin McRae
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    Re: Master cylinder bore size
    #3
    Senior Member Odyknuck's Avatar
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    For your application I would run the 5/8" in front and the 3/4" in the rear. The rear pistons are larger and you need to move more fluid. Just a foot note that rear brakes are the ones needed for stopping power offroad. You do not want the fronts to lock up easly. A locked front tire does not steer.
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    Re: Master cylinder bore size
    #4
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    Dang I just ordered 3/4" for the front and back last night! Oh well, I hope it works good. Also I have two calipers in the front and one in the back, so I'm sure that makes a difference. Also I have four pistons in the front, and only two in the rear! This is why I was looking for help on this. Between the number of calipers, the number of pistons, and the size of the pistons, it's tough for me to know what I need.

    Also I appreciate your input but I disagree about the front brakes. After racing quads for five years I would say the front brakes are way more important. They do all the stopping power. And I don't think it ever locked up the front brakes ever.

    Thanks for your help!
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    Re: Master cylinder bore size
    #5
    Senior Member Odyknuck's Avatar
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    The 3/4" master will work on the front however it may have a stiff feel to it. They have smaller piston requiring less fluid movement. I have an 11/16" master on a seperate brake handle driving a pair of Jamar 2 piston calipers on the front of my 2500# Woodsbuggy. A 5/8" would have been a better choise as it would have given the brakes a better feel. As far as having the most stopping power (front or Back) offroad lets just agree that we can disagree lol.
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