12. OPERATION 12.6.1 BRAKE PERFORMANCE CURVE HD465-5 Method of using graph Example: Downhill distance: 1500 m (4921 ft) Travel resistance – 11% [grade resistance – 13%] [rolling resistance 2%] Load: 46 tons Obtain the maximum permissible speed and the speed range from the graph when traveling downhill under the above conditions. 1. Use the brake performance graph for the downhill distance of 1500 m (4921 ft). 2. Starting from point A which corresponds to the overall weight of the machine, draw a perpendicular line down. 3. Take the point where it crosses the line for travel resistance – 11% as B and draw a horizontal line. Example 2-73