How is the bleeding of the brake system accomplished?

The bleeding of the brake system is primarily accomplished by expelling air from the system. Air trapped in the brake lines can lead to a spongy brake pedal feel and reduced braking efficiency. The process of bleeding involves forcing brake fluid through the system to remove any air bubbles, ensuring that the hydraulic system operates effectively and that there is a solid connection between the brake pedal and the brake calipers.

When air enters the hydraulic brake system, it compresses when the brake pedal is pressed, which diminishes the force applied to the brakes. By bleeding the system, brake fluid is flushed through the lines, and the trapped air is expelled, thus restoring proper brake function and ensuring that the brakes engage firmly upon pressing the pedal.

Adding more brake fluid or changing the brake pads does not address the issue of air in the lines, and replacing the brake fluid, while it may help to some extent, does not specifically focus on eliminating air that affects the brake performance directly. Hence, correctly identifying that air expulsion is the fundamental goal of the bleeding process clarifies why it is essential for effective brake system maintenance.