Verifying the brake test distance accuracy of VBOX

To allow us to verify the brake test measurements obtained by the VBOX unit, we teamed up with some major car and tyre manufacturers to develop an accurate and independent validation. 

We start by using a fixed known starting point for the braking event. We then use a marked line on the test track which has been drawn perpendicular to the direction of travel. This line has to be at precisely 90 degrees to the direction of travel, as it is difficult to drive the car over exactly the same place every time and we need an accurate start point.

We fix a reflective strip along this line, and attach a laser trigger to the side of the vehicle, pointing straight down, to pick up when the car has crossed the line (right). This laser trigger has to be mounted low on the vehicle to reduce any effects from the car pitching as it crosses the line. It is important not to start the braking period until after the vehicle has passed over this line, as the car will begin to yaw under braking, which can cause a lever arm effect on the measurement point.

Read how we verify the brake test distance accuracy of VBOX here>