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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: 1358479" data-attributes="member: 3828"><p>I have no intention of modifying my brakes either. As others have said, they work fine as is. This is more of a winter time mental exercise (for me) than the planning of a modification.</p><p></p><p>Maybe there is an error in my logic somewhere. Here's how I thought of the physics:</p><p></p><p>When you change the size of the pistons in a hydraulic system, to get increased mechanical advantage, and therefore more force delivered by the slave per unit of input force at the master, you could either reduce the diameter of the master cylinder or increase the diameter of the slave cylinder. In either case it would require the master to move further to produce a given amount of movement of the slave, but the power of the movement would be increased by the same amount.</p><p></p><p>Adding a 4th pair of pistons is the equivalent of increasing the area of the slave cylinder, so more total clamping power will be applied to the brake pads per lb of force on the lever, at the expense of more lever motion being required to apply that lb of input force.</p><p></p><p>The increase in area of the added brake pads is a wash. Total friction is independent of the contact area (<a href="https://www.dummies.com/education/science/physics/how-surface-area-affects-the-force-of-friction/" target="_blank">Ref</a>) so the increased hydraulic force of the added pistons should produce more frictional force at the wheel.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1358479, member: 3828"] I have no intention of modifying my brakes either. As others have said, they work fine as is. This is more of a winter time mental exercise (for me) than the planning of a modification. Maybe there is an error in my logic somewhere. Here's how I thought of the physics: When you change the size of the pistons in a hydraulic system, to get increased mechanical advantage, and therefore more force delivered by the slave per unit of input force at the master, you could either reduce the diameter of the master cylinder or increase the diameter of the slave cylinder. In either case it would require the master to move further to produce a given amount of movement of the slave, but the power of the movement would be increased by the same amount. Adding a 4th pair of pistons is the equivalent of increasing the area of the slave cylinder, so more total clamping power will be applied to the brake pads per lb of force on the lever, at the expense of more lever motion being required to apply that lb of input force. The increase in area of the added brake pads is a wash. Total friction is independent of the contact area ([URL="https://www.dummies.com/education/science/physics/how-surface-area-affects-the-force-of-friction/"]Ref[/URL]) so the increased hydraulic force of the added pistons should produce more frictional force at the wheel. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Un-Linking Front Brakes on 2nd Gens (and later)
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