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Originally Posted by arpus maximus
For the brakes, we will use a larger, 12V motor (probably a globe motor) hooked up to either a worm gear or, more likely, a sort of rack with teeth... I don't know what it's called or how else to describe it. This will push the brakes. Preferably this motor can spin in both directions, but we COULD automatically return it to the initial off position via a spring.
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I assume the vehicle has power brakes. These are usually boosted by using engine vacuum. In older models (circa 1970) it was possible to control the brakes by adjusting the vacuum in the booster. (Not recommended for normal driving, but possible). I haven't played with anything more recent that that so I'm not sure about more modern systems. This might be simpler than trying to rig a motor to run the brake pedal.
As other people have mentioned, this is an awful lot of energy for you to be playing with. It would be very easy for you or somebody else to get badly hurt if you are not very careful and systematic in your testing. The key question to keep asking yourself is "How do I stop this thing if ...?" Then demonstrate the stopping features with the car immobilized BEFORE your take it out and try it in a parking lot.
ChrisH