The calibration of brake tester instruments primarily involves a combination of static weight calibration, dynamic comparison, and software-based adjustment. The most common method is static calibration, where known standard weights are applied to the test plates to verify the accuracy of the sensor output. Alternatively, a standard vehicle can be used to perform comparative tests between a certified brake tester and the one being calibrated, identifying and correcting measurement deviations. Additionally, the system software allows fine-tuning of zero points and gain coefficients. For certified vehicle inspection stations, third-party metrology agencies can conduct periodic verification and issue official calibration certificates. The entire calibration process must be carried out in a stable, interference-free environment with the equipment installed on a level surface, using certified weights or force testing devices to ensure the accuracy and reliability of brake test results.