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post #1 of 1 (permalink) Old 12-02-2007, 10:09 PM Thread Starter
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Join Date: Oct 2007
Location: Lindenhurst, NY
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Brembo Basics

So I have gotten tons of questions about what the numbers mean on the Brembo Radial MC and whats the difference between. Thought I would type this up and post it. Feel free to add anything you think is note worthy.

Let take the 16x18 as an example. The first value which is 16 represents the diameter or bore cylinder in millimeters. The second value which is 18, represents the distance between the lever's pivot point and the plunger that pushes into the cylinder

What Do These Numbers Really Mean?


1.) Cylinder diameter (The 16)
- As you increase your cylinder diameter you increase the volume of fluid. By doing this, you are decreasing the pressure which results in less braking power but better feel.
- The trade off is that since your increasing the sensitivity of the lever your decreasing the braking power which we will now discuss in the 2nd number
2.) Pivot Point (The 18)
- As you increase the pivot point, the sensitivity is increasing but your breaking power is now decreasing.
- By increasing this number, the pivot point is larger and now you have reduced your leverage for braking power thus reducing your breaking power

Now Add Calipers to the Equation

Depending on what youíre using the Brembo or any other radial master cylinder for such as racing or stunting will depend on which calipers you have. Letís look at it based on the Cylinder Diameter. Remember from above that as you increase the cylinder diameter, you are increasing the volume of brake fluid being dispensed.

If youíre a stunter, using the a radial master cylinder as a rear hand brake youíre not going to need that much volume since most rear calipers are 1 piston. With this being said, a radial master cylinder with a bore of 14-16mm is more than sufficient to provide enough braking power.

If youíre using the radial master cylinder for racing and the track, then youíre going to want more brake fluid volume and greater braking power. Since most modern front calipers are between 2-4 pistons, you may want slightly more braking power than the 16x18 Brembo. Although the 16x18 Brembo is more than enough for a 2 piston caliper setup, the choice among most racers is the 19x18 setup for a 3-4 piston caliper. For 3-4 piston calipers, the 19mm Bore provides for more brake fluid being dispense which translates into greater braking power, but remember we also need to take into consideration, the leverage of the pivot for the lever. The 18mm represents the pivot point of the lever. The smaller the pivot point becomes, the more leverage, which means more breaking power. Most people find that the 16x18 or the 19x18 provide the perfect balance between braking power and lever sensitivity.

Last edited by Moto-Madness.com; 12-02-2007 at 10:46 PM.
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