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FJR Motorcycle Forums
Technical & Mechanical Problems
Un-Linking Front Brakes on 2nd Gens (and later)
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<blockquote data-quote="Fred W" data-source="post: 1358402" data-attributes="member: 3828"><p>Valid point. The unified brake caliper cylinders <em>are </em>different diameters, which would result in differing amounts of piston thrust for a given amount fluid pressure.</p><p></p><p>Left side Caliper cylinder inside diameters 30.23 mm × 4</p><p></p><p>Right side Caliper cylinder inside diameter (for unified brake) 33.96 mm × 2, 22.65 mm × 2</p><p></p><p>The upper right pistons are slightly larger than the cylinders on the left side caliper, which would produce slightly <em>more </em>thrust for a particular amount of fluid pressure than the pistons on the left side, and the lower unified pistons are <em>significantly smaller</em>, which would cause a lot less thrust force per amount of fluid pressure.</p><p></p><p>The ratio should be linear. So the upper pistons will clamps the pads at 33.96 - 30.23 / 30.23 * 100 = 12.3% more than the left side pads, and the lower (unified) pistons will clamp the pads at 22.65 - 30.23 / 30.23 * 100 = 25.1% less than the left side pistons.</p><p></p><p>It would still be an increase in total brake force, but not 33% as you would expect by increasing from three pairs to 4. It would be a (22.65 / (33.96 + 30.23 +30.23)) * 100 = 23.98% increase in front brake force. Still worthwhile, IMO.</p><p></p><p>And the front brake pads would continue to wear unevenly, as they do now.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1358402, member: 3828"] Valid point. The unified brake caliper cylinders [I]are [/I]different diameters, which would result in differing amounts of piston thrust for a given amount fluid pressure. Left side Caliper cylinder inside diameters 30.23 mm × 4 Right side Caliper cylinder inside diameter (for unified brake) 33.96 mm × 2, 22.65 mm × 2 The upper right pistons are slightly larger than the cylinders on the left side caliper, which would produce slightly [I]more [/I]thrust for a particular amount of fluid pressure than the pistons on the left side, and the lower unified pistons are [I]significantly smaller[/I], which would cause a lot less thrust force per amount of fluid pressure. The ratio should be linear. So the upper pistons will clamps the pads at 33.96 - 30.23 / 30.23 * 100 = 12.3% more than the left side pads, and the lower (unified) pistons will clamp the pads at 22.65 - 30.23 / 30.23 * 100 = 25.1% less than the left side pistons. It would still be an increase in total brake force, but not 33% as you would expect by increasing from three pairs to 4. It would be a (22.65 / (33.96 + 30.23 +30.23)) * 100 = 23.98% increase in front brake force. Still worthwhile, IMO. And the front brake pads would continue to wear unevenly, as they do now. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Un-Linking Front Brakes on 2nd Gens (and later)
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