What should you do if you notice a hydraulic brake pedal that sinks?

If you notice that the hydraulic brake pedal sinks when you apply pressure, it indicates a possible problem within the braking system. This could mean that there is a leak in the hydraulic lines or in the brake components, which can lead to reduced braking effectiveness and potentially result in brake failure.

By inspecting for potential leaks, you can identify the source of the issue, whether it's a leak in the brake lines, the master cylinder, or the brake calipers. Finding and addressing these leaks is crucial for ensuring that your braking system remains safe and functional.

Checking the tire pressure, replacing the brake fluid without identifying the issue, or continuing to drive cautiously without addressing a potentially dangerous brake problem would not be appropriate responses. Safety should always be the top priority, and resolving the underlying issue of a sinking brake pedal is essential before continuing to drive.