| Summary: | No === There are several types of disc brake instabilities associated with the brake systems; however, they are usually
classified into two main categories depending on the frequency range: brake groan 0–300 Hz and brake squeal 1–
16 kHz. The groan is associated with the stick-slip motion while the squeal is associated with the modal coupling.
This paper presents a detailed analysis of low frequency noise (0–300 Hz) in a commercial vehicle trailer disc brake
as a result of stick-slip vibration. A range of experimental techniques are used to understand the characteristic
behaviour of the caliper and the brake pads during braking events on a laboratory test rig. The analysed brake
system comprised a full disc brake assembly and the trailer suspension system with a beam axle. Laser-based
optical displacement sensors were used to investigate the deformation of the caliper body and the brake pads
during a braking application. The contact pressure distribution at the disc/pad interfaces were also measured to
gain more insight into the contact profile of the pad surfaces. Results revealed that the stick-slip phenomenon, in
this study, was a result of the combination of the deformation of the caliper and the friction material formulation of
the brake pads. In addition, it was observed through the testing of two different sets of pads that a low compression
modulus would help to reduce the stick-slip phenomenon.
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