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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brakes, Linings, Drums and Shoes
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<blockquote data-quote="davidd" data-source="post: 120137" data-attributes="member: 1177"><p>I think that it will have the opportunity to work better with the levers hanging down. I am not certain why the lever would move further. A friend of mine walked into the shop when I had all the Vincent brake plates on the bench. He asked what I was doing and I mentioned the problem stated above. He told me that he had changed the lever on his Suzuki rear drum from down to up and in the last race he realized that his rear brake did not work as well as it did before. After I explained what he had done, he moved it to the original down position and it regained its former performance. </p><p></p><p>If you notice that your brakes tend to work better in reverse, then switching the arm would be logical. </p><p></p><p></p><p>If your drums are cast iron I suspect you will find them about the same as Shadow drums. I tend to agree with Trevor that the major problem with Vincent brakes stems from the soft shoes. The shoes are not up to the task. Having changed the shoes I went with high friction linings and the combination seems to work well. </p><p></p><p>However different the performance is from the cam and the trailing shoe, the real culprit is the "equal work condition" problem that has been discussed before. It is almost impossible to get shoes to wear equally. What happens is that the leading shoe is pushed into the drum aggressively and wears very quickly. You are now stuck with the slow wearing (and performing) trailing shoe hitting the drum first until it wears enough to allow the leading shoe to hit the drum aggressively again. Matty has described how this happens. By eliminating or minimizing the trailing shoe you will get better performance. The reasoning is that the trailing shoe is preventing the leading shoe for doing a good job. A soft, high wearing lining on the trailing shoe would be an advantage. This is what Bill Hancock used to advise.</p><p></p><p>Apologies to Corey for the divergence. </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 120137, member: 1177"] I think that it will have the opportunity to work better with the levers hanging down. I am not certain why the lever would move further. A friend of mine walked into the shop when I had all the Vincent brake plates on the bench. He asked what I was doing and I mentioned the problem stated above. He told me that he had changed the lever on his Suzuki rear drum from down to up and in the last race he realized that his rear brake did not work as well as it did before. After I explained what he had done, he moved it to the original down position and it regained its former performance. If you notice that your brakes tend to work better in reverse, then switching the arm would be logical. If your drums are cast iron I suspect you will find them about the same as Shadow drums. I tend to agree with Trevor that the major problem with Vincent brakes stems from the soft shoes. The shoes are not up to the task. Having changed the shoes I went with high friction linings and the combination seems to work well. However different the performance is from the cam and the trailing shoe, the real culprit is the "equal work condition" problem that has been discussed before. It is almost impossible to get shoes to wear equally. What happens is that the leading shoe is pushed into the drum aggressively and wears very quickly. You are now stuck with the slow wearing (and performing) trailing shoe hitting the drum first until it wears enough to allow the leading shoe to hit the drum aggressively again. Matty has described how this happens. By eliminating or minimizing the trailing shoe you will get better performance. The reasoning is that the trailing shoe is preventing the leading shoe for doing a good job. A soft, high wearing lining on the trailing shoe would be an advantage. This is what Bill Hancock used to advise. Apologies to Corey for the divergence. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brakes, Linings, Drums and Shoes
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