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A leading automobile manufacturer's shop manual is up front about the problem.
"Noise at the wheels when brakes are applied - squeaks, squeals, or chatter. Note. Brake friction materials inherently generate noise and heat in order to dissipate energy.
"As a result, occasional squeal is normal and is aggravated by severe environmental conditions such as cold, heat, wetness, snow, salt, mud, etc.
"This occasional squeal is not a functional concern and does not indicate any loss of brake effectiveness."
That explanation seems simple enough. But try telling that to an irate customer after you have just completed a supposedly thorough brake job!
Brake squeal is the number one come-back …