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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brake Shoes and Linings
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<blockquote data-quote="davidd" data-source="post: 99285" data-attributes="member: 1177"><p>Bill,</p><p></p><p>I think that you may be able to buy material directly from Porterfield. Some was sent to someone in Australia a few weeks ago. RD-4 is the material that we have tested and I think it is an excellent performer. It works well cold, which is a must for the street and its coefficient of friction goes up as it gets hotter.</p><p></p><p>For the race track I will keep going up in the coefficient of friction, but I am now getting away from the good cold working linings. The next lining I will try has a coefficient of friction at .70 plus, but it needs to be 250 F to start working. I am guessing that this will not be a suitable street compound due to its poor cold performance. The final lining does not start to bite until it is 400 F. I don't think this lining would work for many racers because the warm temperature is so high, but it may be useful to a racer like Phil Canning who is routinely overheating his brakes with the Twin racer.</p><p></p><p>The biggest obstacle so far has been making the extra shoes to install new linings on. I just finished making a small batch of 8" brake shoes so we can swap out the front shoes on David Tompkin's racer. </p><p>[ATTACH=full]23639[/ATTACH]</p><p>For anyone making shoes for themselves, use a carbide cutter for the steel shoe face for the cam. I found them to be hardened steel which is cast into the shoe. I have had several failures of the stock shoe and 8" shoe faces, H48. It is used on both shoes. H48 appears to deform too readily and creates a depression in the metal where the cam pushes. I think that this cannot happen with the EBC shoes, which is a nice feature.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 99285, member: 1177"] Bill, I think that you may be able to buy material directly from Porterfield. Some was sent to someone in Australia a few weeks ago. RD-4 is the material that we have tested and I think it is an excellent performer. It works well cold, which is a must for the street and its coefficient of friction goes up as it gets hotter. For the race track I will keep going up in the coefficient of friction, but I am now getting away from the good cold working linings. The next lining I will try has a coefficient of friction at .70 plus, but it needs to be 250 F to start working. I am guessing that this will not be a suitable street compound due to its poor cold performance. The final lining does not start to bite until it is 400 F. I don't think this lining would work for many racers because the warm temperature is so high, but it may be useful to a racer like Phil Canning who is routinely overheating his brakes with the Twin racer. The biggest obstacle so far has been making the extra shoes to install new linings on. I just finished making a small batch of 8" brake shoes so we can swap out the front shoes on David Tompkin's racer. [ATTACH=full]23639[/ATTACH] For anyone making shoes for themselves, use a carbide cutter for the steel shoe face for the cam. I found them to be hardened steel which is cast into the shoe. I have had several failures of the stock shoe and 8" shoe faces, H48. It is used on both shoes. H48 appears to deform too readily and creates a depression in the metal where the cam pushes. I think that this cannot happen with the EBC shoes, which is a nice feature. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brake Shoes and Linings
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