How are crane brakes tested during operation, and what are warning signs of brake failure?

• A. Brakes are tested via controlled slowdown and hold checks; warnings include spongy or unresponsive pedals, continued creep when brakes are applied, unusual noise, or overheating
• B. Brakes are tested by gradually increasing engine RPM while the brake is fully applied
• C. Brakes are not tested during operation unless there's a fault
• D. Brake tests are optional and can be skipped

Answer: (A)

Brakes on a mobile crane must be checked while the crane is in operation so you know they will perform under real loads and conditions. A practical approach is to slow down in a controlled way and then apply the brakes to see if the crane can be held at a stop without creeping. This confirms the braking force is adequate, the system responds promptly, and the control is reliable when you need to stop or hold a position.

Notice warning signs that brake performance may be failing: a pedal that feels spongy or unresponsive, meaning hydraulic or mechanical components aren’t transferring force properly; the crane continues to creep or move slowly even when you’re applying the brakes; unusual noises like grinding, squealing, or binding, which can indicate worn parts or misalignment; and overheating, which shows the brakes are dragging or are overworked and could fail soon. If you observe any of these signs, stop and have maintenance inspect and service the braking system before continuing.

These checks are essential because braking performance directly affects control of the load and overall safety during operation.