Which items are critical to check in hydraulic brake systems during a pre-trip inspection?

During a pre-trip inspection, it's essential to assess the hydraulic brake systems to ensure they function properly for safe driving. Checking the brake fluid levels is crucial, as insufficient fluid could lead to brake failure, which is a safety hazard. Additionally, examining the condition of the brake pads is vital because worn-out pads can greatly affect braking performance, potentially resulting in longer stopping distances and increased risk of accidents.

Focusing on hydraulic brake systems specifically highlights the importance of both fluid and pad condition, as these elements work directly to ensure effective braking. In contrast, items like tire pressure, headlight operation, windshield wipers, fuel levels, engine oil levels, and battery condition, while important for overall vehicle safety and functionality, do not pertain directly to the hydraulic braking system and therefore are not the primary focus of this specific inspection task.