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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Trevor Southwell re brakes
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<blockquote data-quote="Monkeypants" data-source="post: 177731" data-attributes="member: 2708"><p>I mentioned that my Rapide brake is stock other than the cables, which are Teflon lined very heavy custom cables from Venhills. I forgot to mention that it also has the alloy Lightning style brake plates and finned Shadow drums. So not really stock at all.</p><p>I'm sure the weaknesses in braking would show up in racing, but for a roadbike it works really well.</p><p>We've only had to test the panic braking once and it almost outstopped the riders.</p><p>We were traveling west on a old Northern California 2 lane highway at 70 mph, came around a gentle bend and there was an old Ford pickup pulling out of a hidden driveway. The driver saw us just as we were about to smack into her. She did the very worst thing possible, she stopped the truck with it sitting right across our lane. There was oncoming traffic so the other lane was not available, even if I had been able to make that adjustment in time.</p><p>I hit both brakes hard and we came to a stop just five or six feet from her door!</p><p>I could see a look of horror on her face.</p><p>I ended up sitting well forward up on the tank with my legs hooked behind the bars. Gina slid forward into the rider's position. Our legs weren't strong enough to hold us back against the braking forces.</p><p>That was pretty impressive braking. My Norton Commando with its stock front and rear disc brakes would not stop that quickly. It might nowadays as I replaced the stock front brake with huge 6 piston 340 mm unit. That stops!</p><p>The Vincent front brakes came to me with one green lining and one red lining on each brake. John Mcdougall suggested that was just someone using up old parts, however I found information on the red and green linings in an old MPH. Iirc the red lining works very well even when completely cold whereas the green lining likes a bit of heat.</p><p>Eventually those linings wore out and I assumed my days of having great brakes on that bike were over.</p><p>I had some new green Ferodo linings on the shelf. These had been purchased at Vintage Brake in the US a few years earlier. I had them bonded onto the old shoes and I think the brake is just as strong as before. I arced them in with stick on emery and also touched up the drums using the stick on emery the other way around. That got rid of all pulsation. For some reason with the new linings in place strong brake pulsation showed up where there had been none of that before. Arcing the linings did not help, the problem was in the drums. It wasn't difficult to fix.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 177731, member: 2708"] I mentioned that my Rapide brake is stock other than the cables, which are Teflon lined very heavy custom cables from Venhills. I forgot to mention that it also has the alloy Lightning style brake plates and finned Shadow drums. So not really stock at all. I'm sure the weaknesses in braking would show up in racing, but for a roadbike it works really well. We've only had to test the panic braking once and it almost outstopped the riders. We were traveling west on a old Northern California 2 lane highway at 70 mph, came around a gentle bend and there was an old Ford pickup pulling out of a hidden driveway. The driver saw us just as we were about to smack into her. She did the very worst thing possible, she stopped the truck with it sitting right across our lane. There was oncoming traffic so the other lane was not available, even if I had been able to make that adjustment in time. I hit both brakes hard and we came to a stop just five or six feet from her door! I could see a look of horror on her face. I ended up sitting well forward up on the tank with my legs hooked behind the bars. Gina slid forward into the rider's position. Our legs weren't strong enough to hold us back against the braking forces. That was pretty impressive braking. My Norton Commando with its stock front and rear disc brakes would not stop that quickly. It might nowadays as I replaced the stock front brake with huge 6 piston 340 mm unit. That stops! The Vincent front brakes came to me with one green lining and one red lining on each brake. John Mcdougall suggested that was just someone using up old parts, however I found information on the red and green linings in an old MPH. Iirc the red lining works very well even when completely cold whereas the green lining likes a bit of heat. Eventually those linings wore out and I assumed my days of having great brakes on that bike were over. I had some new green Ferodo linings on the shelf. These had been purchased at Vintage Brake in the US a few years earlier. I had them bonded onto the old shoes and I think the brake is just as strong as before. I arced them in with stick on emery and also touched up the drums using the stick on emery the other way around. That got rid of all pulsation. For some reason with the new linings in place strong brake pulsation showed up where there had been none of that before. Arcing the linings did not help, the problem was in the drums. It wasn't difficult to fix. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Trevor Southwell re brakes
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