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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brakes, Linings, Drums and Shoes
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<blockquote data-quote="Matty" data-source="post: 120123" data-attributes="member: 1339"><p>My comet brakes have always been bad ever since I bought it in 1956.</p><p>It originally had the old green (Mintex?) linings which were not too bad if I remember but since then I have tried 4 or 5 different makes of professionally fitted on linings and have also tried the following tricks.</p><p>The brakes however seem to work well once or twice in the morning but then just fade away - which I had put down to a fine layer of rust, - but this happens every day !!</p><p>1. Had oversized linings turned to fit the drums - no improvement.</p><p>2. Cut about a quarter of the trailing shoe lining off, reasoning that the leading shoe wears most just leaving the pretty ineffective trailing shoe to push on the drum. - this also means there is more leverage on the trailing shoe because the metal shoe is longer than the lining and perhaps the shorter trailing shoe wears faster. This gives a small improvement.</p><p>3. Tried different brake reliners who promised their linings would fix it. This did not work.</p><p></p><p>I know that the brake arms are set to operate at near 90degrees and the cables, compensation arm etc are all set to optimum and have rebuilt and owned many bikes both British, German, Italian, and Japanese over the last 60+ years and have only ever had poor brakes with the Comet in all the 100,000 miles I have done on it.</p><p>I am surprised that the forum states that the brake cam has a different lift depending on which way it is operated, I have never noticed this which could account for my problem if the cams are reversed - will go out now, take the front wheel out and have a look but have also had thoughts in the past of making the cams shorter to give more leverage but obviously more movement at the handlebar lever.</p><p>I have been through this before on the forum many years ago but will have another go when the Corona virus shutdown is in operation, or will use the Fireblade when I really want to stop !!</p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 120123, member: 1339"] My comet brakes have always been bad ever since I bought it in 1956. It originally had the old green (Mintex?) linings which were not too bad if I remember but since then I have tried 4 or 5 different makes of professionally fitted on linings and have also tried the following tricks. The brakes however seem to work well once or twice in the morning but then just fade away - which I had put down to a fine layer of rust, - but this happens every day !! 1. Had oversized linings turned to fit the drums - no improvement. 2. Cut about a quarter of the trailing shoe lining off, reasoning that the leading shoe wears most just leaving the pretty ineffective trailing shoe to push on the drum. - this also means there is more leverage on the trailing shoe because the metal shoe is longer than the lining and perhaps the shorter trailing shoe wears faster. This gives a small improvement. 3. Tried different brake reliners who promised their linings would fix it. This did not work. I know that the brake arms are set to operate at near 90degrees and the cables, compensation arm etc are all set to optimum and have rebuilt and owned many bikes both British, German, Italian, and Japanese over the last 60+ years and have only ever had poor brakes with the Comet in all the 100,000 miles I have done on it. I am surprised that the forum states that the brake cam has a different lift depending on which way it is operated, I have never noticed this which could account for my problem if the cams are reversed - will go out now, take the front wheel out and have a look but have also had thoughts in the past of making the cams shorter to give more leverage but obviously more movement at the handlebar lever. I have been through this before on the forum many years ago but will have another go when the Corona virus shutdown is in operation, or will use the Fireblade when I really want to stop !! Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brakes, Linings, Drums and Shoes
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