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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: 96108" data-attributes="member: 1177"><p>John,</p><p></p><p>R-4 is their traditional race compound and they make another R-4 that is a Kevlar woven lining. RD-4 is a later development. </p><p>[ATTACH=full]22330[/ATTACH]</p><p>Four stock Vincent shoes were $119 not including shipping. I have had a set of 4 stock shoes relined, one pair of new shoes relined (for a rear brake use) and four 8" shoes relined with RD-4. Unfortunately, they ground the 8" shoes too thin by mistake and had to do them again. This meant the shoes came a little late to get them to David Tompkins for testing this weekend. They will be tested in July instead.</p><p></p><p>I don't mind sharing all of the info I have, but I have been a little coy about these linings because they have not been tested. At a minimum, the Ferotec D3920 and the Green Gripper linings have been Vincent tested. The RD-4 linings have been used on car drum brakes for quite a while so, I am fairly confident they will work, but the devil is in the details. We might find the fine on the front, but not the rear, or something similar. </p><p></p><p>I am not certain as to why more companies do not disclose the coefficient of friction. It is a number that is required to be used in the design of the brake, so it is logical that you would want to know what the number is of the replacement. It may be that the numbers do not show linear performance and can be misunderstood. Some companies do repackaging and don't want you to go shopping around them. In the U.S. the DOT requires the "edge code" be on the linings, but thin linings don't show the edge code. At least you can purchase something with the same edge code, which reflects the hot and cold coefficient number.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 96108, member: 1177"] John, R-4 is their traditional race compound and they make another R-4 that is a Kevlar woven lining. RD-4 is a later development. [ATTACH=full]22330[/ATTACH] Four stock Vincent shoes were $119 not including shipping. I have had a set of 4 stock shoes relined, one pair of new shoes relined (for a rear brake use) and four 8" shoes relined with RD-4. Unfortunately, they ground the 8" shoes too thin by mistake and had to do them again. This meant the shoes came a little late to get them to David Tompkins for testing this weekend. They will be tested in July instead. I don't mind sharing all of the info I have, but I have been a little coy about these linings because they have not been tested. At a minimum, the Ferotec D3920 and the Green Gripper linings have been Vincent tested. The RD-4 linings have been used on car drum brakes for quite a while so, I am fairly confident they will work, but the devil is in the details. We might find the fine on the front, but not the rear, or something similar. I am not certain as to why more companies do not disclose the coefficient of friction. It is a number that is required to be used in the design of the brake, so it is logical that you would want to know what the number is of the replacement. It may be that the numbers do not show linear performance and can be misunderstood. Some companies do repackaging and don't want you to go shopping around them. In the U.S. the DOT requires the "edge code" be on the linings, but thin linings don't show the edge code. At least you can purchase something with the same edge code, which reflects the hot and cold coefficient number. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brake Shoes and Linings
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