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    Brake master cylinder size
    #1
    Senior Member Jerm's Avatar
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    I have this 5/8" diameter master cylinder. I want to use it with 2 front brakes from an ATV, and one rear willwood caliper I got from protodie. Do you guys figure 5/8" master cyl will be large enough for 3 calipers? Maybe need to upgrade to 3/4"?
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    Re: Brake master cylinder size
    #2
    Junior Member
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    You should be fine with what you have. Most ATVs would have a 10 or 12 mm Master. Which model of Wilwood caliper do you have?
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    Re: Brake master cylinder size
    #3
    Senior Member Jerm's Avatar
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    Its this one, its a single piston caliper.

    brake caliper

    BTW Harv, what part of Ont are you at?
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    Re: Brake master cylinder size
    #4
    Millenium Member Xbird's Avatar
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    13mm is the atv/bike standard bore, I upped to a 5/8ths bore to run 2 calipers. a large part of the choice has to do with how much piston travel and fluid displacement there is in the calipers. Try the 5/8ths, but you may need to upgrade because of the difference in the calipers
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