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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brake Fettling
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<blockquote data-quote="Pete Appleton" data-source="post: 4323" data-attributes="member: 145"><p><strong>Vincent design not perfect</strong></p><p></p><p>Leaving aside the reprehensible vices (vises) of some correspondents, has anyone thought of a way around the design flaw in the Vincent brake set-up?</p><p></p><p>Profiling the shoes to suit the drum, as suggested by Robert is surely the way to go to get a good brake, initially, but what happens after a few miles? The Vincent design uses leading and trailing shoes. The shoe with the operating cam at the leading end makes use of the 'self wrapping' effect and gives more braking effort than the trailing shoe. More braking effort = more lining wear. Conversly the trailing shoe will have less wear. This is demonstrated on many car and commercial vehicle applications where the leading shoe is actually supplied thicker than the trailing one from new. Unfortunately the Vincent design has no provision for wear compensation. The cam position and the anchor position are both fixed. This means that the leading shoe may only wear down at the same rate as the trailing shoe otherwise it will not contact the drum. We have, in effect, got twin trailing shoe brakes. The 8" drum system mentioned in MPH this month looks worthwhile but has it still got the same problem?</p><p></p><p>Has anyone got any clever thoughts for an adjustable cam or anchor that will allow for different rates of wear?</p><p></p><p>Pete</p></blockquote><p></p>
[QUOTE="Pete Appleton, post: 4323, member: 145"] [b]Vincent design not perfect[/b] Leaving aside the reprehensible vices (vises) of some correspondents, has anyone thought of a way around the design flaw in the Vincent brake set-up? Profiling the shoes to suit the drum, as suggested by Robert is surely the way to go to get a good brake, initially, but what happens after a few miles? The Vincent design uses leading and trailing shoes. The shoe with the operating cam at the leading end makes use of the 'self wrapping' effect and gives more braking effort than the trailing shoe. More braking effort = more lining wear. Conversly the trailing shoe will have less wear. This is demonstrated on many car and commercial vehicle applications where the leading shoe is actually supplied thicker than the trailing one from new. Unfortunately the Vincent design has no provision for wear compensation. The cam position and the anchor position are both fixed. This means that the leading shoe may only wear down at the same rate as the trailing shoe otherwise it will not contact the drum. We have, in effect, got twin trailing shoe brakes. The 8" drum system mentioned in MPH this month looks worthwhile but has it still got the same problem? Has anyone got any clever thoughts for an adjustable cam or anchor that will allow for different rates of wear? Pete [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brake Fettling
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