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 Review of Weight Transfer When we apply the braking force, weight transfer happens to the front. Therefore, front vertical force gets heavier, and rear vertical force gets lighter. Brake force is the horizontal force proportional to the vertical reaction force. The proportional constant is tire friction coefficient μ. The role of rear brake is very important for vehicle stability. Rear brake force should always not only keep its quantity not to provoke wheel locking but also keep its maximum quantity just below the force level causing the rear wheel locked up. That is the way to use the brake system with the maximum efficiency.  Optimum Brake force distribution – Normalized Force The picture above shows an optimum brake force distribution curve. Vertical axis represents normalized braking force of rear wheel F nr , and horizontal axis represents the normalized braking force of front wheel F nf .  Here, the normalized force means its value is dimensionless. The two normal...