I haven't read all the replies in this thread so sorry if any of this has already been mentioned. At first the lever seems like a brilliant idea, but just thinking about it for a few minutes I can think of a few problems, so I'll list them and perhaps you can take them into consideration. -If I try pushing down on a conventional lever it is rather uncomfortable, requiring me to loosen my grip and move my fingers quite a bit, push down on the top of the lever with just the tips and it also means I'd only be gripping the bar with my thumb. -There is the chance of accidentally pushing the wrong brake. If the down stroke is applied to the front brake and the normal to the rear, in the event of an emergency brake as the rider pulls the rear hard they may also push the lever down, and everyone knows whacking the front brake on sharply is bloody dangerous. -In most situations just a front brake would be sufficient, a skilled cyclists will rarely use the rear brake over the front. You say this is designed for those with disabilities, what sort of disability denies you the use of your hand to such an extent that you cannot operate a brake lever, yet you can still hold the handle bar safely. I'm sure there are probably some, just none came to mind. -The same basic principle can be achieved much easier, cheaper and safer. For example, to compliment a normal brake lever another can be installed on the end of the bar, such as those used on ergo bars on road bikes, which would be operated with the two outer fingers. This would allow individual control of each brake as well as the possibility to accurately apply both at once and will also allow the bar to be gripped safely while operating the brakes.