Why is the brake pedal on my Audi A4 feeling spongy?

I've noticed that my Audi A4's brake pedal has a spongy feeling when I press down on it. It doesn't affect the braking performance, but it's making me worried. Is this normal or should I get it checked?

It's common for Audi A4's to have a slightly spongy brake pedal. This is due to the car's electronic brake system, which may sometimes cause this sensation. However, if you noticed a sudden change in the pedal's resistance, it's worth getting it checked by a mechanic.

I've noticed the same thing on my Audi A4. After consulting with my mechanic and doing some research, I found out that it's a sign of air in the brake lines. It's essential to bleed the brakes and flush the brake fluid to get rid of any air bubbles and ensure proper brake function.