@picky perkins
Currently,the technology being developed includes a motor inside LG wheel
the concept being "tugless pushback and taxiing" to save fuel.
motor-generators are alreadywell-proven technology on this aircraft and was in commercial use in the 1950's-60's Bond and Messerschmitt 3-wheelers both used SIBA DYNASTART.
What you're proposing is regenerative braking -using the energy to supply the power to apply the brakes to absorb the energy....won't work without a huge Capacitor or another s/b battery.
Much better to use an electro-mechanical system-say reversible servo-motor/leadscrew(worm) and nut arrangement which would leave the brake"pressure" at the point the energy gave out.
Nice idea but fundamentally flawed,i'm afraid.