Brake creep groan is a low frequency vibration that occurs when a vehicle is starting to move

from a stopped condition. As the brake pressure is reduced, motion can result from the drag

torque in automatic vehicles or from the negative gradient in manual vehicles when being on

a slope. This situation can induce brake vibrations that reach the driver with a pronounced

acoustic annoyance.

Brake creep groan is commonly thought to result from the stick-slip motion between the

friction material and the rotor surface. This paper recognizes the importance of this local

effect as a necessary condition to trigger the creep groan, but expands the focus and explores

the mechanism of interaction between this incipient vibration caused precisely by low level

stick-slip events and the final harmonic response that shakes the whole vehicle.

Molina N, García, J.J Sánchez A, Squadrani F, Applus+ IDIADA, Spain.