Ever wondered why large trucks and trailers use air brakes instead of the hydraulic brakes found in most cars? In this video, we break down the engineering and safety reasons behind this essential ...

That simply means ridding the brake system of trapped air, but some of the old fluid ... one of which is shown in a typical location in the above illustration. (Drum brakes also have similar ...

you'll also need to bleed the brake system afterward. Check out this handy step-by-step guide to learn how to do this.

In one, there’s a failure in the air brake system, which supplies compressed air to the brake, which keeps them open while driving, Brown said. Without that compressed air, the brakes are ...