Before backing your tractor under the trailer, make sure your trailer brakes are:
Answers
Disengaged.
Locked.
Deactivated.
Dry.
The Correct Answer and Explanation is:
Correct Answer: Locked
Before backing a tractor under a trailer, it is essential to ensure that the trailer brakes are locked. This precaution is a critical step in ensuring safety during the coupling process. Here’s why:
Explanation:
1. Preventing Trailer Movement
When a tractor backs up to connect with a trailer, the force exerted by the tractor can cause the trailer to shift or roll. If the trailer brakes are not locked, even slight movement could result in misalignment, making coupling more difficult and increasing the risk of an accident. Locked brakes stabilize the trailer, keeping it securely in place.
2. Safety of Personnel and Equipment
If the trailer moves unexpectedly during coupling, it could pose a hazard to personnel working nearby. For example, an unstable trailer could roll away, leading to potential injuries or damage to property. Locked brakes prevent such scenarios, ensuring that the trailer remains stationary until it is securely connected to the tractor.
3. Proper Coupling Alignment
Locked brakes facilitate proper alignment between the tractor’s fifth wheel and the trailer’s kingpin. Misalignment can lead to incomplete coupling, which may cause the trailer to detach during transit, endangering road users and cargo.
4. Industry Best Practices
Locking the trailer brakes is a standard operating procedure in the trucking industry. It aligns with safety protocols aimed at reducing accidents during the coupling and uncoupling process. Many companies mandate this step in their guidelines, emphasizing its importance.
Key Tip for Drivers
Before beginning the coupling process, always engage the trailer’s emergency air brakes by pulling out the trailer air supply valve (red knob) on the tractor’s dashboard. This action ensures the brakes remain locked.
By prioritizing this step, drivers enhance safety, protect their equipment, and ensure compliance with industry standards.