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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: 95656" data-attributes="member: 1177"><p>Green Gripper Woven is .52 cold and .43 hot. AM4 is .44 cold and .41 hot. It has been used by Vincent owners for a few years.</p><p></p><p><a href="http://www.scanpac.com/cm/pdfs/tds-GGW.pdf" target="_blank">http://www.scanpac.com/cm/pdfs/tds-GGW.pdf</a></p><p></p><p>I would think this would be the minimum you would want. </p><p></p><p>Yes, I have been doing a lot of work on this and David Tompkins has done some low speed testing on a .61 lining that I put on some stock Vincent shoes. I have six shoes, two 7" and four 8" shoes that are being relined right now with the .61 lining. If I get them to David in time for the next race at the end of May I will have some good feedback.</p><p></p><p>I originally thought that the high friction linings would mitigate the softness of the shoes on the Vincent and provide more braking power with less squeeze. It looks like that may be true based on David using only about 30% of the lever travel to come to a complete stop, but I decided that the this was not a good solution for the racers or performance bikes.</p><p></p><p>I am not sure that I would characterize my efforts as "stumbling across", but I went looking for a shoe I could use on the Vincent. I chose a Honda brake shoe:</p><p>[ATTACH=full]22189[/ATTACH]</p><p>This shoe was reasonably close, but metric and a little big. The width is 30 mm instead of 7/8". The diameter is 180 mm instead of 178 mm. The pivot needed moving to make this brake work without compromising the very thick lining bed.</p><p>[ATTACH=full]22190[/ATTACH]</p><p>Here it is slimmed down with the pivots moved. I wanted to remove the lining and arc the bare shoes to the proper diameter. I milled most of the lining of with a rotary table and fine tuned them on a sander. I did this until I got the exact same contour on the new show as an unbent stock shoe.</p><p>[ATTACH=full]22191[/ATTACH]</p><p>This can be done with a 1/2" bolt and a square block on the cam end to check your work.</p><p>[ATTACH=full]22192[/ATTACH]</p><p>The finished shoes above have been sent for lining, as mentioned.</p><p></p><p>Several notes: I did not need to machine the brake shoes for fitting a speedo. I have not drilled the shoe for the cotter pin, yet. Finally, I had to mark the shoe so that the lining would be bonded only on the 90 degree section from the center of the shoe. The stock shoe has those dips to prevent extending the lining. I simply transferred marks from the dips on the stock shoes. This replicates the 90 degree arc and the 35 degree heel angle that Vincent wanted.</p><p></p><p>As I have mentioned before, there is no serious harm in using extended linings. They need to be clearanced much more at the heel and toe ends so the lining does not touch the drum easily. The dips in the original shoes prevented the linings from being bonded to the low pressure areas of the shoe and getting in the way of the harder working middle. As a test, I felt it was best to stay close to stock on the geometry. Stiffness of the shoes aside, this means the coefficient of friction is the only change. I am hoping the combination will provide much better stopping.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 95656, member: 1177"] Green Gripper Woven is .52 cold and .43 hot. AM4 is .44 cold and .41 hot. It has been used by Vincent owners for a few years. [URL]http://www.scanpac.com/cm/pdfs/tds-GGW.pdf[/URL] I would think this would be the minimum you would want. Yes, I have been doing a lot of work on this and David Tompkins has done some low speed testing on a .61 lining that I put on some stock Vincent shoes. I have six shoes, two 7" and four 8" shoes that are being relined right now with the .61 lining. If I get them to David in time for the next race at the end of May I will have some good feedback. I originally thought that the high friction linings would mitigate the softness of the shoes on the Vincent and provide more braking power with less squeeze. It looks like that may be true based on David using only about 30% of the lever travel to come to a complete stop, but I decided that the this was not a good solution for the racers or performance bikes. I am not sure that I would characterize my efforts as "stumbling across", but I went looking for a shoe I could use on the Vincent. I chose a Honda brake shoe: [ATTACH=full]22189[/ATTACH] This shoe was reasonably close, but metric and a little big. The width is 30 mm instead of 7/8". The diameter is 180 mm instead of 178 mm. The pivot needed moving to make this brake work without compromising the very thick lining bed. [ATTACH=full]22190[/ATTACH] Here it is slimmed down with the pivots moved. I wanted to remove the lining and arc the bare shoes to the proper diameter. I milled most of the lining of with a rotary table and fine tuned them on a sander. I did this until I got the exact same contour on the new show as an unbent stock shoe. [ATTACH=full]22191[/ATTACH] This can be done with a 1/2" bolt and a square block on the cam end to check your work. [ATTACH=full]22192[/ATTACH] The finished shoes above have been sent for lining, as mentioned. Several notes: I did not need to machine the brake shoes for fitting a speedo. I have not drilled the shoe for the cotter pin, yet. Finally, I had to mark the shoe so that the lining would be bonded only on the 90 degree section from the center of the shoe. The stock shoe has those dips to prevent extending the lining. I simply transferred marks from the dips on the stock shoes. This replicates the 90 degree arc and the 35 degree heel angle that Vincent wanted. As I have mentioned before, there is no serious harm in using extended linings. They need to be clearanced much more at the heel and toe ends so the lining does not touch the drum easily. The dips in the original shoes prevented the linings from being bonded to the low pressure areas of the shoe and getting in the way of the harder working middle. As a test, I felt it was best to stay close to stock on the geometry. Stiffness of the shoes aside, this means the coefficient of friction is the only change. I am hoping the combination will provide much better stopping. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brake Shoes and Linings
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