What is the recommended action if you feel the brake pedal sinking?

When the brake pedal feels like it's sinking, it's an indication that there may be an issue with the air brake system, such as a potential air leak. Air leaks can compromise the braking system's effectiveness, leading to reduced braking power, which is critical for safety while driving. By performing an immediate inspection for air leaks, the driver can identify and address any problems before they escalate, ensuring the vehicle remains safe to operate. This proactive approach helps prevent potential brake failure and enhances overall vehicle reliability.

The other actions, while important in their own contexts, do not address the immediate concern presented by a sinking brake pedal. Checking tire pressure and tread depth relates to tire performance rather than brake issues. Adjusting the seat might improve driver control but does not resolve brake performance concerns. Continuing to drive could lead to dangerous situations when the brakes may fail entirely. The recommended inspection is essential for maintaining safety on the road.