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Drum brake (upper right) with the drum removed (lower left, inside facing up), on the front of a Ford Falcon Sprint A rear drum brake on a Kawasaki W800 motorcycle. A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating bowl-shaped part called a brake drum.
The "gaseous boundary layer" is a hot rod mechanics explanation for failing self servo effect of drum brakes because it felt like a brick under the brake pedal when it occurred. To counter this effect, brake shoes were drilled and slotted to vent gas. In spite of that, drum brakes were abandoned for their self-servo effect.
Honda RCB with a front ventilated drum brake from Italian accessories manufacturer Grimeca. Drum brakes have a self servo effect. [11] The most common design is a leading-trailing design. More exotic design had four, eight or sixteen shoes. [4] Some motorcycles used finned and/or vented housings for additional cooling, the first of which was ...
In the 1960s, Bendix automotive brakes blossomed with the introduction of fixed-caliper disc brakes and the "Duo-Servo" system (which became, virtually, a de facto world standard for drum brakes). During the 1960s, Bendix also dabbled in bicycle hardware, producing a reliable, totally self-contained, 2-speed "Kick-Back" planetary rear axle with ...
Most drum brake designs have at least one leading shoe, which gives a servo-effect. By contrast, a disc brake has no self-servo effect, and its braking force is always proportional to the pressure placed on the brake pad by the braking system via any brake servo, brake pedal, or lever.
Four wheel, cable operated, drum brakes were fitted from the start but unusually a vacuum servo was an option. The handbrake had its own set of shoes on the rear brakes. The steel section chassis had semi-elliptic leaf springs all round. [1]
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