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Quarter of the century back manufacturers of brake blocks most advantageously applied asbestos as a part of a frictional material: its properties guaranteed stable and high enough coefficient of friction, and a high temperature threshold (to 800 °) supposed a wide field of maintenance of substance. However, the asbestos component has also series of minuses. The basic - ecological danger: as a result of a friction the material rejects a dust which is delayed in air, and getting to lungs, the serious injury causes to health.
And here, in the early nineties, in many countries of the world, campaign for substitution of ecologically dirty product on more safe materials started; necessity of searching of equal substitution to asbestos became acute. Experiments with, for example, steel filaments, reinforcing threads from kevlara have begun, fiber glass etc. So the period of organic and metal pads has occurred.
However, the fresh technological stream was brought by company Akebono which has devised effective frictional structure with the ceramics component. The invention has made revolution in the industry of brake blocks as showed excellent indexes - absence of noise and vibration, and also a fixed coefficient of friction at wide temperature amplitude. The present ceramic brake blocks did not contain some ferroalloys, and thus there was no contact piece "metal-metal" between pads and a disk (fraught not only heightened deterioration for a disk, but also "sticking" of surfaces). Company Power Stop, the USA became one of the first manufacturers of pads on such technique.
However, for today there is no definition - how many and what elements should contain ceramic pads. Thus, the manufacturer could take a metal pad, spray some portion of a ceramic material in frictional structure and to name its ceramic. It has led to a wide variety of indexes in operation of brake blocks of different manufacturers. And as consequence
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