What is an indication of brake drag in a hydraulic system?

An indication of brake drag in a hydraulic system is the excessive heat generated from the brake components. Brake drag occurs when the brake pads or shoes stay in contact with the rotor or drum after the brakes are released. This lingering contact leads to increased friction, which subsequently generates abnormal heat. As the temperature rises, it can cause discoloration of the braking components, warp rotors, or even lead to brake fade, significantly affecting the performance and safety of the braking system.

In the context of a hydraulic braking system, monitoring for excessive heat is crucial since it can also lead to premature wear of components or failure of brake fluid due to overheating. Proper maintenance and checks can help in identifying such issues before they become serious problems.