Mechanic Tests - Air Brakes Foundation

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1) The most hazardous element used in the composition of brake lining as far as the mechanic is concerned is:
2) One of the most important reasons air brakes have been chosen over hydraulic brakes in heavy duty vehicles, is that air brake systems are more tolerant to system leaks.
3) The device used for adjusting the brakes on an S-cam, drum type air brake system is the :
4) The "S" cam of a foundation brake assembly functions as a:
5) The air compressor for air brake system is usually pressure lubricated by: