Do you park close to the curb? If the tyre is tight against the curb, it could be causing the leak. I once was being driven mad by intermittent leaks, until I was walking away from my car and I heard the leak.Do you park close to the curb? If the tyre is tight against the curb, it could be causing the leak. I once was being driven mad by intermittent leaks, until I was walking away from my car and I heard the leak.