The ratio of the inspected tire speed (third roller speed) decrease is called “slip rate”. The working principle is as follows: the tires of the inspected vehicle drive the third rollers to rotate, so as to obtain the real-time speed of the tires. When the inspected vehicle is braked, the tire speed will decrease rapidly. And when the maximum braking force is reached and the tire speed meets a minimum critical point, friction between the tires and the rollers will occur. At this time, the brake tester motors must immediately cut off the power and stop the rotation of the rollers, so as to prevent the tire being worn out due to the large difference between the tire speed and the roller speed.
When you use the roller brake tester, have you ever encountered the phenomenon that the motor starts normally, but the rollers stop rotating before applying brake? This is caused by the looseness or failure of the third roller speed signal sensor. Since the speed signal of the third roller cannot be obtained, the motor of the brake tester will stop immediately to prevent the tire from being damaged by the continuous measurement. When this phenomenon occurs, you need to drive the vehicle away from the brake tester, carefully check the sensor at the gear end (or hole end) of the third roller, and adjust the distance between it and the gear (or hole), less than 2mm is the best. If the above problem still cannot be solved, you may need to replace a new sensor. We also recommend that you include the checking of the sensor on the daily routine list of the equipment, which is as important as checking the condition of the tires before you driving.
