Once the acceleration tests have been completed, the braking distance tests are performed on the same flat stretch of asphalt paved rail trail. The ebike is acceleration to it’s maximum assisted speed. Once the front wheel crosses a line marked on the pavement, both brakes are applied to their maximum level. In many cases, the rear wheel will lift off of the ground. Once stopped, the distance from the line to the bottom of the front wheel are measured and recorded. This is repeated as many as needed to have at least 3 stops in each direction without any major outliers.
Now, I understand that rider skill has a lot to do with braking distances. However, braking distances can vary due to tire compound, type of brakes, and road surface. Brake tests are only performed when the asphalt surface is clean, dry, and the surface temperature is between 50 and 80 degrees F. Due to the variability in these tests, they should serve as only a guideline but it helps to understand how quickly a certain ebike can be brought to a stop.
Some ebikes are now equipped with ABS systems and I can’t wait to get my hands on one of those!