What must the hoist ropes do if the car or counterweight comes to rest on their buffer?

When a car or counterweight comes to rest on their buffer, the hoist ropes must release traction. This is because the buffers are designed to provide a controlled stop for the elevator car or counterweight, absorbing any kinetic energy and allowing for a safe, cushioned stopping process. If the hoist ropes maintain tension or grip in this situation, it could lead to excessive strain on the system and potentially cause damage or malfunction. The release of traction serves to alleviate this strain, ensuring that the static load does not exert undue stress on the hoistway components and maintains the integrity of the entire elevator system.

Understanding this dynamic is crucial for effective hoistway maintenance, as it helps ensure safety and functionality in elevator systems. Other options such as increasing tension, maintaining grip, or loosening ties would not be appropriate responses in this situation, as they could compromise safety and lead to potential failures.