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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Front Brake Arm
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<blockquote data-quote="Tom Gaynor" data-source="post: 23327" data-attributes="member: 4034"><p>No difference. On the Vin the leading shoe remains the leading shoe regardless of direction of cam rotation. The brake shoe doesn't care which way the cam rotates. While most 2LS designs have a linkage so that the brake arms move in the same direction, some use a Vincent-like combination of cable outer push and inner pull to move the two arms in opposition. One is as effective as the other - in fact the scissors pull is a more elegant solution, because it automatically ensures the two shoes bite equally hard (almost) without the cost and complexity of a link. (The downside must be that if the outer compresses more than the inner stretches the push doesn't equal the pull. Let's not go there.)</p><p>One way there is slightly more leverage / less mechanical advantage because the cam hits the shoe face at a smaller radius, but the leading shoe servo effect ought to swamp the lever pull.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 23327, member: 4034"] No difference. On the Vin the leading shoe remains the leading shoe regardless of direction of cam rotation. The brake shoe doesn't care which way the cam rotates. While most 2LS designs have a linkage so that the brake arms move in the same direction, some use a Vincent-like combination of cable outer push and inner pull to move the two arms in opposition. One is as effective as the other - in fact the scissors pull is a more elegant solution, because it automatically ensures the two shoes bite equally hard (almost) without the cost and complexity of a link. (The downside must be that if the outer compresses more than the inner stretches the push doesn't equal the pull. Let's not go there.) One way there is slightly more leverage / less mechanical advantage because the cam hits the shoe face at a smaller radius, but the leading shoe servo effect ought to swamp the lever pull. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Front Brake Arm
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