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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="RossKean" data-source="post: 1358487" data-attributes="member: 19880"><p>I agree with it being more interest and mental exercise.</p><p></p><p>You can calculate total force based upon the relative areas of the master and slave pistons and the force per square inch with the pad area thrown in. I understand the theoretical aspects of force/friction/area as per the reference you provided.</p><p></p><p>The theory, however, breaks down when you consider the physical real world interactions. The same friction over a smaller area means that the temperature at the point of contact will be higher. A significant temperature change will affect the coefficient of friction by affecting the chemical and physical properties of the materials in contact.</p><p></p><p>Also, your article mentions that the theory breaks down if you are getting enough force to cause the object to "dig in". This is exactly what happens when you consider the sintered metallic particles interacting with the rotor surface. The effects of pad (and) rotor ablation will vary as a function of the amount of pressure at the point of contact - the "tearing" force will be in some way proportional to the absolute pressure at the contact point. Sort of the way that tires wear faster with aggressive braking and acceleration. With the tires, the contact area remains the same but the forces per square inch are higher with aggressive riding. The same total energy (work) applies in each case. Whether braking requires more lever force or not remains to be seen but brake temperatures and wear should be less.</p><p></p><p>I am not sure how this will translate to the real world but I am sure that it isn't necessarily as simple as it would seem at first glance. Again, let's do the test and adjust theory as needed.</p><p></p><p>(This is me sitting here waiting for a Nor'easter and a foot of snow expected to hit later today. I expect that it has already hit your area.)</p></blockquote><p></p>
[QUOTE="RossKean, post: 1358487, member: 19880"] I agree with it being more interest and mental exercise. You can calculate total force based upon the relative areas of the master and slave pistons and the force per square inch with the pad area thrown in. I understand the theoretical aspects of force/friction/area as per the reference you provided. The theory, however, breaks down when you consider the physical real world interactions. The same friction over a smaller area means that the temperature at the point of contact will be higher. A significant temperature change will affect the coefficient of friction by affecting the chemical and physical properties of the materials in contact. Also, your article mentions that the theory breaks down if you are getting enough force to cause the object to "dig in". This is exactly what happens when you consider the sintered metallic particles interacting with the rotor surface. The effects of pad (and) rotor ablation will vary as a function of the amount of pressure at the point of contact - the "tearing" force will be in some way proportional to the absolute pressure at the contact point. Sort of the way that tires wear faster with aggressive braking and acceleration. With the tires, the contact area remains the same but the forces per square inch are higher with aggressive riding. The same total energy (work) applies in each case. Whether braking requires more lever force or not remains to be seen but brake temperatures and wear should be less. I am not sure how this will translate to the real world but I am sure that it isn't necessarily as simple as it would seem at first glance. Again, let's do the test and adjust theory as needed. (This is me sitting here waiting for a Nor'easter and a foot of snow expected to hit later today. I expect that it has already hit your area.) [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Un-Linking Front Brakes on 2nd Gens (and later)
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