Question

Why do brakes of a car fail when air enters in the brake pipes

Answer 1

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Air is much less dense when compared to the brake fluid. This means if air is in the lines it will compress too easily.

Answer 2

Answer:

Because air is very compressible. The Brakes work by applying pressure to the fluid in one end of the brake pipe, the fluid is not compressible, so the force of that pressure is delivered through the fluid to the calipers at the other end of the pipe closing them on the disc.

Explanation: