What does it mean to bleed brake?

Bleeding brakes is the process of removing air bubbles from the brake lines to ensure proper brake function. Air in the brake lines can lead to a spongy brake pedal and reduced braking efficiency. The process typically involves using a special tool or method to open the brake bleeder valve on each brake caliper while the brake fluid is replenished to remove trapped air. This ensures that the brake system is filled with fluid and functions effectively.