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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: 149089" data-attributes="member: 1177"><p>Patrick had his racing brakes done by Dick Hunt in Surrey. I believe that Dick recommended 3920 for use front and rear, but said that 3920 was often used on the rear with a more aggressive lining used on the front. It is easier to generate a lot of heat upfront on a racer, but street bike fronts run very cold.</p><p></p><p>As far as I know, Dick used 2520V on his front brakes. He supplied the lining to Vintage Brake for some time before the UK distributor of 2520V closed shop in the UK. I think the tables turned and Vintage Brake supplied Dick Hunt with the lining for a while. Dick preferred to use the grooved 2520V. It ran much cleaner as the brake debris could exit quickly via the grooves. Also, it was less likely to tramline.</p><p></p><p>When I spoke with Porterfield, they said that RD-4 was their top racing drum brake lining. The coefficient of friction is around .5, which is higher than the .44 of AM4, but the higher the mu, the hotter the lining needs to get to achieve it. The big benefit of RD-4 is that it will not fade. It hangs in much longer than other linings. Linings that have higher coefficients of friction are often unpredictable. They provide very high braking when hot, but if they cool a bit on a straight before a corner, they may not provide much stopping power.</p><p></p><p>A word of caution on lining names. If the manufacturer uses a name it is fine. If the retailer uses a name, it is probably made up. The retailers do not want you to know who the manufacturer is. Thus, they choose a name to market the product. They may choose to use the same numbers, or they may not. There is usually not a lot of consistency in the name selection. Porterfield's long-time racing drum lining was dubbed R-1. But R-4 is a different lining and R4-1 is also a different lining with a very high coefficient of friction. It is difficult to find a listing of all their linings.</p><p></p><p>I am not certain that Dick Hunt is still in business. He may not be advertising to keep his workload low.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 149089, member: 1177"] Patrick had his racing brakes done by Dick Hunt in Surrey. I believe that Dick recommended 3920 for use front and rear, but said that 3920 was often used on the rear with a more aggressive lining used on the front. It is easier to generate a lot of heat upfront on a racer, but street bike fronts run very cold. As far as I know, Dick used 2520V on his front brakes. He supplied the lining to Vintage Brake for some time before the UK distributor of 2520V closed shop in the UK. I think the tables turned and Vintage Brake supplied Dick Hunt with the lining for a while. Dick preferred to use the grooved 2520V. It ran much cleaner as the brake debris could exit quickly via the grooves. Also, it was less likely to tramline. When I spoke with Porterfield, they said that RD-4 was their top racing drum brake lining. The coefficient of friction is around .5, which is higher than the .44 of AM4, but the higher the mu, the hotter the lining needs to get to achieve it. The big benefit of RD-4 is that it will not fade. It hangs in much longer than other linings. Linings that have higher coefficients of friction are often unpredictable. They provide very high braking when hot, but if they cool a bit on a straight before a corner, they may not provide much stopping power. A word of caution on lining names. If the manufacturer uses a name it is fine. If the retailer uses a name, it is probably made up. The retailers do not want you to know who the manufacturer is. Thus, they choose a name to market the product. They may choose to use the same numbers, or they may not. There is usually not a lot of consistency in the name selection. Porterfield's long-time racing drum lining was dubbed R-1. But R-4 is a different lining and R4-1 is also a different lining with a very high coefficient of friction. It is difficult to find a listing of all their linings. I am not certain that Dick Hunt is still in business. He may not be advertising to keep his workload low. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brake Shoes and Linings
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