When the car is not started, the brake works, but after starting, the brake pedal goes straight to the floor. What could be the issue?

Is there a strange noise when the car starts, but it goes away once driving? Does anyone know what this could be?

What could be the issue if the start-stop system is not working?

2019 Changan Yuexiang, after normal driving and parking, when trying to start the car again, the brake pedal is hard and the car won't start. What should I do? Urgent!

Why does the brake pedal on the JAC Shuailing T8 not return to position? It works fine when I lift the brake pedal with my foot. What's going on? Does anyone else have the same issue?

I recently got a 2013 model 2014 Scirocco GTS. Why does the car start shaking and not move when I floor the gas pedal to start?

What could be the reason that there seems to be something blocking the brake pedal when I press the brake on a 207?

What could be the reason that the brake pedal cannot be pressed down when turning the steering wheel fully or reversing?

When the car is not started, the brake works, but after starting, the brake pedal goes straight to the floor. What could be the issue?

When starting the engine, the malfunction indicator light flashes briefly and then goes off after starting. What could be the issue?

When the car starts normally and the brake pedal becomes hard after driving a certain distance, what could be the reason?