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Question:

Why should you drain water from compressed air tanks?

A In cold weather water can freeze and this can cause brake failure.
explanation

Compressed air usually has some water and some compressor oil in it, which is bad for the air brake system. For example, the water can freeze in cold weather and cause brake failure. The water and oil tend to collect in the bottom of the air tank. Be sure that you drain the air tanks completely. Each air tank a is equipped with a drain valve in the bottom. (According to CDL Handbook)

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