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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brakes
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<blockquote data-quote="greg brillus" data-source="post: 83436" data-attributes="member: 597"><p>The design of the common drum rear brakes on contemporary cars actually allows the shoes to completely self center, as the shoes are actuated at one end by a slave cylinder with two opposed pistons which themselves can move left or right to center the shoes. At the opposite end of the shoes there is an adjuster that is generally like a small screw jack. This holds the two shoes apart, but the shoes are firmly held against this adjuster with a stiff spring. The two shoes also generally have linings of different lengths to assist in offsetting the servo action and to help with the ware characteristics of this set up. The end where the adjuster is can basically move at will and has no "anchor" at all. Of course this type of brake has a massive advantage of being hydraulically operated, most drum brakes use a line pressure at around 600 PSI which is far better than cables and levers. I think the manufacturers of Drum brakes for bikes have to be mindful of the design of "Servo".......self energizing brakes, so as the front wheel does not "Lock up" too easily, which would end up with results nearing a design that approaches the dangers of a front end that can readily go into a "Speed wobble"..............<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" />............<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" />.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 83436, member: 597"] The design of the common drum rear brakes on contemporary cars actually allows the shoes to completely self center, as the shoes are actuated at one end by a slave cylinder with two opposed pistons which themselves can move left or right to center the shoes. At the opposite end of the shoes there is an adjuster that is generally like a small screw jack. This holds the two shoes apart, but the shoes are firmly held against this adjuster with a stiff spring. The two shoes also generally have linings of different lengths to assist in offsetting the servo action and to help with the ware characteristics of this set up. The end where the adjuster is can basically move at will and has no "anchor" at all. Of course this type of brake has a massive advantage of being hydraulically operated, most drum brakes use a line pressure at around 600 PSI which is far better than cables and levers. I think the manufacturers of Drum brakes for bikes have to be mindful of the design of "Servo".......self energizing brakes, so as the front wheel does not "Lock up" too easily, which would end up with results nearing a design that approaches the dangers of a front end that can readily go into a "Speed wobble"..............:eek:............;). [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brakes
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