2. Brake pedal pulsates or vibrates. This can also be a sign of air in the brake system. When you press on the brake pedal, you may feel a pulsing or vibrating sensation.
3. Brakes squeal or grind. Air in the brake system can also cause the brakes to squeal or grind. This is because the air bubbles can cause the brake pads to chatter against the rotors.
4. Brake fade. This is a dangerous condition that can occur if there is air in the brake system. Brake fade occurs when the brakes lose their stopping power. This can happen if the air bubbles in the brake system cause the brake fluid to boil.
To get the air out of a brake system, you will need to bleed the brakes. Bleeding the brakes involves opening the brake line at the wheel cylinders or calipers and allowing the air to escape. You will need a brake bleeder wrench and a clear tube to bleed the brakes.
Bleeding the brakes can be a messy and time-consuming process, but it is important to do it correctly in order to ensure that your brakes are working properly. If you are not comfortable bleeding the brakes yourself, you can take your car to a mechanic to have it done.