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Interrupter Brake Levers
Secondary brake levers that "interrupt" the cable housings used with "æro" brake levers on drop handlebars. These allow the rider to brake while holding on to the top/middle section of the drop handlebar.
Instead of pulling on the inner cable, interrupter levers activate the brakes by pushing on the cable housing.
These are an updated version of the extension levers popular in the late '70s, without the drawbacks of the older designs.
This style of brake lever was first popularized by cyclocross riders, with the result that they're sometimes known as "cross levers" or "cyclocross levers" but there is actually nothing about them that makes them more suitable for cyclocross bikes than for any other drop bar application.
