JJ Keller Entry Level Driver Training for CDL (Commercial Driver’s License) Practice Test 2025 - Free CDL Practice Questions and Study Guide

Easing pressure on the fifth wheel locking jaws before uncoupling is essential to ensure a safe and smooth separation from the trailer. By properly locking the trailer brakes and then backing up gently, you effectively relieve the tension that builds up between the tractor and the trailer. This action allows the locking jaws to open more easily and reduces the risk of damage to the equipment or injury during the uncoupling process.

When the trailer brakes are locked, the trailer remains stationary while the tractor moves backward slightly. This slight movement helps to disengage any pressure that may have accumulated in the fifth wheel connection, making it easier to uncouple. It demonstrates proper technique and safety awareness in handling the vehicle.

Other choices do not promote a safe or effective way to relieve pressure. For example, releasing the trailer brakes would allow the trailer to move, potentially complicating the uncoupling process and increasing the risk of jackknifing or other issues. Accelerating then decelerating unexpectedly or shifting gears before uncoupling do not directly address the need to relieve pressure on the fifth wheel locking jaws and may create unnecessary risks.