This type of device has been standard on "Water Jet" drive boats since their inception. Although it's NOT represented as a Brake, but rather as a reverse gear for backing up. A clamshell like device rotates down behind the nozzel and redirects the jet pumps thrust foreward. Water jets are known for poor handling at slow (idle) speed and most have Bow Thrusters to help with docking.
This same clamshell idea is used on jet planes (reverse thrust) to slow them down after touchdown, combined with the normal braking. NB
PS: Interestingly, the Brake lever in the video is on the LEFT handlebar....just the Opposite of a motorcycle. The handbrake on ALL motorcycles is on the Right, .. and the Left lever is the clutch, which disengages the drive system when pulled. All controls on motorcycles have been standardized (by law) as to location, no matter the manufacturer.
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