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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Installing a Front Disc Brake on a Series ‘C’
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<blockquote data-quote="davidd" data-source="post: 94018" data-attributes="member: 1177"><p>Andrew,</p><p></p><p>I never had alignment problems with the disc brake calipers. It may have been that I was lucky. I machined the two caliper mounts together and they attach to the forks through the axle hole and a bolt through the brake anchor, so there was no float in my caliper mount set-up.</p><p></p><p>As Tim mentions, the Bramptons tend to bend with a good drum brake. Kal Karrick bent the fork on his Series A twin racer in his first race outing with a Series A brake. The Brampton forks need the tiny brace that was done on the TT machines, at a minimum.</p><p></p><p>I stopped investing time in disc brake conversions when I started to race because I had to use drum brakes by rule. Drum brakes can be a lot more powerful than disc brakes, but as the drums become more powerful, they become less stable also, meaning that they can be grabby. Disc brakes rarely become grabby. </p><p></p><p>The reason drums can be more powerful than discs is because the drums with even a single leading shoe use the geometry and the friction of the lining to become self energizing. The disc does not have much self energizing, thus the need for hydraulics to increase the work the calipers do.</p><p></p><p>Vincent Speet's brake is designed to self energize a great deal, maybe something like 300% more than the stock drum. The 8" brake is maybe 100% more than the stock brake. Both brakes can perform much better or much worse by adjusting the coefficient of friction on the brake linings. Unfortunately, that is a more tedious process than just squeezing the lever of your disc brake harder! So, I think disc brakes are a good solution to better braking performance on a Vincent. For those who want to stick to drums I think Vincent Speet's brakes will do the job nicely.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 94018, member: 1177"] Andrew, I never had alignment problems with the disc brake calipers. It may have been that I was lucky. I machined the two caliper mounts together and they attach to the forks through the axle hole and a bolt through the brake anchor, so there was no float in my caliper mount set-up. As Tim mentions, the Bramptons tend to bend with a good drum brake. Kal Karrick bent the fork on his Series A twin racer in his first race outing with a Series A brake. The Brampton forks need the tiny brace that was done on the TT machines, at a minimum. I stopped investing time in disc brake conversions when I started to race because I had to use drum brakes by rule. Drum brakes can be a lot more powerful than disc brakes, but as the drums become more powerful, they become less stable also, meaning that they can be grabby. Disc brakes rarely become grabby. The reason drums can be more powerful than discs is because the drums with even a single leading shoe use the geometry and the friction of the lining to become self energizing. The disc does not have much self energizing, thus the need for hydraulics to increase the work the calipers do. Vincent Speet's brake is designed to self energize a great deal, maybe something like 300% more than the stock drum. The 8" brake is maybe 100% more than the stock brake. Both brakes can perform much better or much worse by adjusting the coefficient of friction on the brake linings. Unfortunately, that is a more tedious process than just squeezing the lever of your disc brake harder! So, I think disc brakes are a good solution to better braking performance on a Vincent. For those who want to stick to drums I think Vincent Speet's brakes will do the job nicely. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Installing a Front Disc Brake on a Series ‘C’
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