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Classic Goldwing Technical Forums
General Classic Goldwing Technical Forum
Ok front brakes now
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<blockquote data-quote="DaveKamp" data-source="post: 212080" data-attributes="member: 5122"><p>Now, when you make a caliper with TWO small pistons side-by-side, you can make a pad thats long and skinny, following the curve of a smaller-diameter disk, but still have lots of surface area for hydraulic pressure AND contact surface. </p><p></p><p>Brakes have two important numbers... first is contact surface... this is the area that a brake pad contacts on a disk... the other is swept area... which is the area of a disk that GETS contacted as the pad passes. The difference may not be obvious... a long skinny pad on a double-piston caliper that follows the radius of a disk may have the same contact surface area as a big square pad on a single caliper... but the 'track' that the skinny pad makes, is much narrower than the larger pad.</p><p></p><p>The skinny pad allows a smaller diameter disk, but that skinny pad on a small diameter disk has less SWEPT AREA than the larger pad/single caliper. This means the skinny pad's acting surface is getting a higher braking energy-concentration in the disk, than the larger swept area. There's a big mess of thermal dissipation math involved here, but safe to say that the skinny pad on dual piston calipers means you have a small amount of metal accepting a much larger concentration of heat, in a short period of time. That makes the disk expand funny, and overheat fast...</p><p></p><p>Is it kinda stuffy in here? Am I going too fast? I can open a window...</p></blockquote><p></p>
[QUOTE="DaveKamp, post: 212080, member: 5122"] Now, when you make a caliper with TWO small pistons side-by-side, you can make a pad thats long and skinny, following the curve of a smaller-diameter disk, but still have lots of surface area for hydraulic pressure AND contact surface. Brakes have two important numbers... first is contact surface... this is the area that a brake pad contacts on a disk... the other is swept area... which is the area of a disk that GETS contacted as the pad passes. The difference may not be obvious... a long skinny pad on a double-piston caliper that follows the radius of a disk may have the same contact surface area as a big square pad on a single caliper... but the 'track' that the skinny pad makes, is much narrower than the larger pad. The skinny pad allows a smaller diameter disk, but that skinny pad on a small diameter disk has less SWEPT AREA than the larger pad/single caliper. This means the skinny pad's acting surface is getting a higher braking energy-concentration in the disk, than the larger swept area. There's a big mess of thermal dissipation math involved here, but safe to say that the skinny pad on dual piston calipers means you have a small amount of metal accepting a much larger concentration of heat, in a short period of time. That makes the disk expand funny, and overheat fast... Is it kinda stuffy in here? Am I going too fast? I can open a window... [/QUOTE]
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Classic Goldwing Technical Forums
General Classic Goldwing Technical Forum
Ok front brakes now
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