Why do some car models still make screeching brake noises even after several sets of brake pads have been replaced?
2025-05-30
Whether they're imported brands or domestic ones, this unusual noise issue exists regardless of brand size.
First, let’s talk about the coefficient of friction. The coefficient of friction is defined as the ratio of the frictional force between two surfaces to the normal force acting perpendicular to those surfaces. It depends on the roughness of the surfaces but is independent of the size of the contact area. Now, here’s the question: Is a higher coefficient of friction always better for a good set of brake pads? Of course not. Typically, the choice of brake pad friction coefficient is determined by factors like the vehicle’s chassis weight and engine displacement. Generally speaking, vehicles with heavier chassis and larger engine displacements require brake pads with a relatively higher friction coefficient. Conversely, cars with lighter chassis tend to perform better with lower-friction brake pads.
So we’ll find that high-quality brand brake pads, like Dibao and Huiwei, come in a variety of friction coefficients, ranging from 0.33 to 0.48. On the other hand, some lesser-known brands offer a single, fixed friction coefficient across their entire lineup. Naturally, this uniformity can compromise both comfort and safety, while also increasing the likelihood of noise generation.
So, what’s the situation with friction materials? During a previous visit to a repair shop, someone told me he was using carbon-ceramic brake pads—they’re incredibly high-end, trendy, and absolutely silent.
Hearing this, I can’t help but express my deep admiration—what an incredible supplier he has, even coming up with names for the materials himself!
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