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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Max's Brake Tips
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<blockquote data-quote="greg brillus" data-source="post: 50217" data-attributes="member: 597"><p>I kind of understand where you are all coming from, However.............what exactly do you suggest.....Do you think if a Vincent had a magnificent four leading shoe front brake like a Fontana or Gremica that setting up the brakes would be any different. If you reline the shoes oversize, and mount the shoes, cams etc on the backing plate and true it up in the lathe, then machine the linings down either using a shim under the cam face or simply machining the OD of the linings down 20 thou under the ID of the drum to which that backing plate assy belongs.....this will give good results. The pivot ends of the shoes from a good four leader may not be on a pin fixture of 360 degrees, as per a Vincent, but they are still anchored opposite the cams in a similar way, that is that they do not move around and realign themselves as to give a better servo action. They work well because they are big, and have lots of surface area. The bent pins and so on you describe, I think, are due to poorly fitting shoes. Say ones that have been relined, radius ground (like the shoes for a car) and then installed....perhaps into oversized drums....how can a brake work like this correctly, or else ( and this is reeeeeeeally common) grease has found it's way from the bearings to the lining surface, so the old handle bar lever gets a really good squeeze to try and stop the machine. The pins bend because they are the weakest link. The brakes on my Rapide work very well because I have all good components, and took the time to set them up as I described earlier, but how many owners go to this kind of trouble, or have a lathe to do so. Because a Vincent has small brakes, they need setting up carefully to get anywhere near good results...........Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 50217, member: 597"] I kind of understand where you are all coming from, However.............what exactly do you suggest.....Do you think if a Vincent had a magnificent four leading shoe front brake like a Fontana or Gremica that setting up the brakes would be any different. If you reline the shoes oversize, and mount the shoes, cams etc on the backing plate and true it up in the lathe, then machine the linings down either using a shim under the cam face or simply machining the OD of the linings down 20 thou under the ID of the drum to which that backing plate assy belongs.....this will give good results. The pivot ends of the shoes from a good four leader may not be on a pin fixture of 360 degrees, as per a Vincent, but they are still anchored opposite the cams in a similar way, that is that they do not move around and realign themselves as to give a better servo action. They work well because they are big, and have lots of surface area. The bent pins and so on you describe, I think, are due to poorly fitting shoes. Say ones that have been relined, radius ground (like the shoes for a car) and then installed....perhaps into oversized drums....how can a brake work like this correctly, or else ( and this is reeeeeeeally common) grease has found it's way from the bearings to the lining surface, so the old handle bar lever gets a really good squeeze to try and stop the machine. The pins bend because they are the weakest link. The brakes on my Rapide work very well because I have all good components, and took the time to set them up as I described earlier, but how many owners go to this kind of trouble, or have a lathe to do so. Because a Vincent has small brakes, they need setting up carefully to get anywhere near good results...........Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Max's Brake Tips
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