What is a Wig Wag in CDL Training?

In the realm of commercial driving, safety is paramount. One of the critical components that ensure a driver’s awareness of air pressure in braking systems is the wig wag. This mechanical device acts as a low air pressure warning signal, alerting drivers when the air pressure in the braking system drops below a safe threshold. Understanding the wig wag and its functionality is essential for any commercial driver, especially those preparing for the CDL (Commercial Driver’s License) test.

Comparison of Wig Wag Types and Applications

Type of Wig Wag	Functionality	Application	Reset Mechanism
Automatic Wig Wag	Drops arm when pressure < 60 psi	Standard for most commercial vehicles	Automatically resets above 60 psi
Manual Wig Wag	Drops arm when pressure < 60 psi	Used in older or specific vehicles	Must be manually reset
Electronic Warning System	Provides digital alerts and visual cues	Modern vehicles with advanced systems	Automatic reset based on system pressure

Understanding the Wig Wag Mechanism

What is a Wig Wag?

A wig wag is a type of low air pressure warning signal designed to enhance the safety of vehicles equipped with air brakes. When the air pressure in the braking system falls below 60 psi, the wig wag device drops a mechanical arm into the driver’s line of sight, serving as a visual warning.

Importance of Wig Wags in CDL Training

During CDL training, understanding the function of the wig wag is crucial. It is not only a safety feature but also a requirement for passing the air brake section of the CDL exam. Candidates must demonstrate knowledge of how the wig wag operates and the implications of low air pressure on braking performance.

Types of Wig Wags

Automatic Wig Wag

The automatic wig wag is the most common type found in modern commercial vehicles. It is designed to drop into view when the air pressure falls below the safe operating level and automatically rises when pressure returns to a safe range. This ensures that drivers are continually informed of their braking system’s status.

Manual Wig Wag

The manual wig wag, while less common today, is still used in some older vehicles. Unlike its automatic counterpart, it requires the driver to manually reset the arm after the air pressure has stabilized. This type demands a higher degree of diligence from the driver, emphasizing the importance of regular maintenance checks.

Electronic Warning Systems

With advancements in technology, many newer vehicles are equipped with electronic warning systems that provide real-time data on air pressure levels. These systems often replace traditional wig wags, offering digital alerts and visual cues on the dashboard. However, understanding traditional wig wag mechanisms remains essential for CDL candidates.

Technical Features of Wig Wags

Feature	Automatic Wig Wag	Manual Wig Wag	Electronic Warning System
Visibility	Mechanical arm	Mechanical arm	Digital display
Pressure Activation	< 60 psi	< 60 psi	Varies
Reset Mechanism	Automatic	Manual	Automatic
Maintenance Requirements	Minimal	Regular checks needed	Software updates may be required

Tips for CDL Candidates

1. Familiarize Yourself: Understand how the wig wag operates and its importance in your vehicle’s safety system.
2. Practice Inspection: During your pre-trip inspection, check the functionality of the wig wag and other air brake components.
3. Stay Informed: Keep updated with the latest regulations and technologies related to air brakes and safety mechanisms.
4. Consult Resources: Use platforms like www.truckingtruth.com and uniontestprep.com for practice tests and additional information.

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Conclusion

The wig wag serves a vital role in ensuring the safety of commercial vehicles equipped with air brakes. Understanding its function, types, and technical features is essential for all CDL candidates. By familiarizing themselves with these concepts, drivers can enhance their knowledge and ensure safe operating practices on the road.

FAQ

What is the primary function of a wig wag?
The primary function of a wig wag is to serve as a low air pressure warning signal. It alerts the driver when the air pressure in the braking system falls below 60 psi by dropping a mechanical arm into view.

How does an automatic wig wag differ from a manual wig wag?
An automatic wig wag resets itself when the air pressure returns to a safe level, while a manual wig wag requires the driver to reset it manually.

Why is it important for CDL candidates to understand wig wags?
Understanding wig wags is crucial for CDL candidates because it is a key component of the air brake system, and knowledge of it is necessary for passing the CDL exam.

What happens when the air pressure drops below 60 psi?
When the air pressure drops below 60 psi, the wig wag activates, dropping a mechanical arm into the driver’s view as a warning signal.

Are electronic warning systems replacing wig wags?
Yes, many modern vehicles are now equipped with electronic warning systems that provide digital alerts, but traditional wig wags are still important for understanding basic air brake operations.

What should a driver do if the wig wag activates?
If the wig wag activates, the driver should safely reduce speed and check the air pressure, looking for potential leaks or mechanical issues.

How often should a driver inspect the wig wag?
Drivers should inspect the wig wag during their pre-trip inspections to ensure it is functioning correctly and is ready to provide warnings when needed.

Can a wig wag malfunction?
Yes, like any mechanical device, a wig wag can malfunction. Regular maintenance checks are necessary to ensure its proper operation.

What is the required air pressure for safe braking operation?
Safe braking operation typically requires an air pressure level above 60 psi; anything below that triggers the wig wag warning.

Where can I find more information about CDL training?
You can find more information and resources related to CDL training on websites such as www.truckingtruth.com, www.dmv-written-test.com, and cdl-prep.com.