What is a common indication for needing new brake linings?

A drop in the height of the brake pedals is a common indication that new brake linings may be needed. This can occur when the brake lining material wears down, causing increased clearance in the brake system. As the lining wears away, the distance the brake pedal travels before engaging the brake increases, which can result in the pedal feeling lower than normal during operation. This symptom is crucial as it often signifies that the braking system is not functioning optimally, leading to a decreased braking performance that can pose a safety risk.

In contrast, the other options provided do not directly relate to the condition of the brake linings. A decrease in engine performance is typically associated with engine issues rather than brake wear. A change in color of the brake light might indicate other electronic issues or the need for maintenance, but it does not necessarily reflect the condition of the brake linings. A clicking sound when braking could suggest a different type of mechanical issue, such as problems with brake hardware or components, rather than the need for new linings specifically. Thus, observing a drop in brake pedal height is a more direct and relevant indication of worn brake linings.