About pistons diameter...- Mtbr.com
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  1. #1
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    About pistons diameter...

    should the pistons be as small as possible? for example should i have a 22MM piston over a 25MM piston?

    whats the difference between the pistons? how does the piston size effect the brake?

  2. #2
    Meh.
    Reputation: XSL_WiLL's Avatar
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    It's the ratio of the size of the MC piston to the caliper piston that makes a different. Using different sizes allows it to achieve mechanical advantage.

  3. #3
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    ok so you are saying that the pistons diameter wont matter as the ratio of the size of the MC piston to the caliper piston?

  4. #4
    trail addict
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    Quote Originally Posted by NIRAN
    ok so you are saying that the pistons diameter wont matter as the ratio of the size of the MC piston to the caliper piston?
    Pretty much, more specifically, ratio of the surface area (for practical purposes) of the pistons. For a normal, circular piston (or cylinder), as the size (diameter) increases, the area will increase by a squared factor.... twice the diameter relates to quadruple the area.
    You better just go ahead and drop that seatpost down to the reflector... the trail gets pretty rough down there.

  5. #5
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    Quote Originally Posted by NIRAN
    ok so you are saying that the pistons diameter wont matter as the ratio of the size of the MC piston to the caliper piston?

    The ratio of master piston to slave piston area set the mechanical advantage of the system.

    The larger the slave piston the lower the required system pressure.

    The longer the insertion depth of the slave cylinder the less the ability to flex to absorb untrueness.

  6. #6
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    Nobody has mentioned this but, smaller brake pistons necessitates higher pressure, smaller MC piston facilitates higher pressures. Higher pressures cause more hose deformation.

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