The influence of the temperature of disc brakes on the vehicle stopping efficiency

Abstract

The vehicle exploitation is characterized by vehicle start from steady state, the acceleration – achievement of the desired speed, the constant movement, the deceleration – adjustment to the road and traffic conditions and vehicle stop. How the main focus of the paper is placed on the braking system, during the deceleration or stopping, the braking system is activated and it comes to the increment of the temperature of parts which are in contact (the brake disc and brake pads). Depending from the driving conditions and number of stops, the temperature of parts which are in contact will rise, while the coefficient of friction will change in each next braking cycle, as well as the time necessary for the vehicle to stop. The investigation was conducted in laboratory conditions on the test rig BRAKE DYNO 2020. With the increment of the number of cycles, the temperature rises, and the coefficient of friction rises as well, and after some temperature is passed, the coefficient of friction decreases. From where comes out the conclusion, that stopping time also changes, with the change of the temperature in the contact between the brake disc and brake pad, because of the change of the coefficient of friction.