In braking performance analysis, which chart helps determine the allowable brake energy?

• A. Load factor charts
• B. Brake limit charts
• C. Tire temperature charts
• D. Drag charts

Answer: (B)

In braking performance analysis the key factor is how much energy the braking system can safely dissipate without overheating or reaching limits of the tires and brakes. This is the allowable brake energy, which depends on speed, weight, brake temperatures, and tire friction conditions. Brake limit charts map this safe envelope, showing the maximum energy (or deceleration) that can be absorbed under given conditions. By comparing the energy you expect to dissipate during braking to the chart’s limits, you can determine whether a planned braking maneuver stays within safe bounds or requires adjustments in speed or configuration to avoid brake fade or tire overload. The other charts don’t directly represent the braking energy capacity: load factor charts focus on structural loads, tire temperature charts on tire thermal states, and drag charts on aerodynamic drag. So the chart that directly helps determine allowable brake energy is the brake limit chart.