In essence you are using the same system f1 is using - capturing energy by using an alternative method to slow the vehicle down. In your case, it's using a separate wheel, but it could just as easily be done using the existing wheels already on the ground.
It has been suggested that you use something attached to the engine, which is connected to the drivetrain, which is connected to something already in touch with the road surface - and in essence would do the same thing you are proposing, just without the additional hardware.
Just keep in mind that you would be changing the brake bias no matter what system you use, and that could result in a dangerous skid. be careful and think this all the way through.
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