The plastic wasn't resistant to the brake fluid (not all plastics are created equal). It caused the plastic to dry and become very brittle. Sorry to hear of your misfortune, but yet another reason not to use brake fluid as a paint stripper.
Flush it with water in hopes of stopping the reaction. You might be able to salvage most of the body, which would allow you to repair/replace the damaged parts.
Sounds as if the Future reacted with the paint, possibily because the paint hadn't fully cured or the decals either. When you say leather texture do you mean orange peel effect.
You've discovered a niche...making slot car bodies!