Drum brake designs Drum brake

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rendering of drum brake


drum brakes typically described either leading/trailing or twin leading.


rear drum brakes typically of leading/trailing design (for non-servo systems), or primary/secondary (for duo servo systems) shoes being moved single double-acting hydraulic cylinder , hinged @ same point. in design, 1 of brake shoes experiences self-applying effect, irrespective of whether vehicle moving forwards or backwards. particularly useful on rear brakes, parking brake (handbrake or footbrake) must exert enough force stop vehicle traveling backwards , hold on slope. provided contact area of brake shoes large enough, isn t case, self-applying effect can securely hold vehicle when weight transferred rear brakes due incline of slope or reverse direction of motion. further advantage of using single hydraulic cylinder on rear opposite pivot may made in form of double-lobed cam rotated action of parking brake system.


front drum brakes may of either design in practice, twin leading design more effective. design uses 2 actuating cylinders arranged both shoes use self-applying characteristic when vehicle moving forwards. brake shoes pivot @ opposite points each other. gives maximum possible braking when moving forwards, not effective when vehicle traveling in reverse.


the optimum arrangement of twin leading front brakes leading/trailing brakes on rear allows more braking force @ front of vehicle when moving forwards, less @ rear. helps prevent rear wheels locking up, still provides adequate braking @ rear.



shimano nexus front hub roller brake


the brake drum made of cast iron, though vehicles have used aluminum drums, particularly front-wheel applications. aluminum conducts heat better cast iron, improves heat dissipation , reduces fade. aluminum drums lighter iron drums, reduces unsprung weight. because aluminum wears more iron, aluminum drums have iron or steel liner on inner surface of drum, bonded or riveted aluminum outer shell.


roller brakes specially designed drum brakes bicycles, mounted side of wheel s hub.








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