What causes a hissing sound when brakes applied to Toyota solara even when the vehicle is at a stop light?

A hissing sound when brakes are applied to a Toyota Solara, even at a stop light, may indicate air escaping from the brake system, often due to a vacuum leak in the brake booster or a failing master cylinder. It could also stem from worn brake pads or low brake fluid, causing the brake system to create additional noise. If the sound persists, it's advisable to have the brake system inspected by a professional to ensure safety and proper functionality.