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This paper will survey different noise matrices used in the brake industry to evaluate brake noise performance on dynamometers. Results that show temperature dependence, temperature history, braking power as well as brake pressure and initial velocity will be presented. Statistical analysis of both dynamometer and road test cycles will be presented. The results will emphasize how different cycles cover the space of pressure, initial temperature, initial speed, and stop brake power. Recommendations for controlling the different parameters will be given.

This paper presents results of experimental investigation into the creep groan problem of disc brakes when used on rear axles of cars and light trucks. Improvements in test procedures and data analysis leads to clearly defined limit cycles in the motion of brake components. The limit cycles are related to both brake design and axle resonances. Creep groan frequency and signature are shown to depend on the choice of friction material. Simple monotonic friction models are shown to be limited in their capability of describing creep groan motion.