Aimed at the squeal problem induced by friction between brake pair when vehicle brakes，a test bench for researching the noise of automotive disc brake is set up, and the experimental research on brake squeal is performed. The time history of some key parameters affecting brake squeal such as the rotational speed of brake disc, brake pressure, torque parameter, and the noise signal for brake squeal are tested. Based on these signals, the relations of the coefficient of friction between the brake disc and pads with the brake pressure, the temperature of surface of brake pair, rotational speed and time, are investigated for the specific initial speed. Time domain and frequency domain methods are used to analyze the sound pressure signal obtained from brake squeal, respectively, and the signal characteristics and spectral components are also researched. These efforts will be helpful for understanding and revealing the generation mechanism of automotive brake squeal.