When inspecting hydraulic brakes, what is essential to check?

When inspecting hydraulic brakes, checking the brake fluid levels and the condition of brake lines is essential because these components directly affect the braking performance and safety of the vehicle. Brake fluid is crucial for the hydraulic system to operate properly; insufficient fluid can lead to brake failure or reduced responsiveness. Additionally, examining the brake lines ensures there are no leaks or damage that could compromise the integrity of the braking system. If the lines are deteriorated or leaking, it may not provide the necessary pressure for the hydraulic system to function effectively, posing a serious safety risk while driving. Thus, this inspection is a critical aspect of ensuring that the vehicle's braking system is reliable and operates as intended.