Frequently Asked Questions About Peterbilt 388 Air Tanks, Wraps & Mounting

Will these air tanks fit my specific year Peterbilt 388, and what are the mounting bracket requirements?

Our air tanks are designed to fit Peterbilt 388 models from 2006-2015. However, mounting compatibility can vary based on your truck's configuration. Single tank setups typically use standard frame rail mounting brackets, while dual tank configurations may require specific crossmember brackets. We recommend checking your existing tank diameter (usually 24" or 26") and measuring the frame rail spacing before ordering. If you're unsure, contact us with your VIN and we can verify fitment.

What's the difference between aluminum and steel air tanks, and which is better for my application?

Aluminum tanks are approximately 40% lighter than steel, reducing overall vehicle weight and improving fuel economy. They're also naturally corrosion-resistant, making them ideal for trucks operating in humid climates or areas with road salt. Steel tanks are more budget-friendly and extremely durable against impact damage. For long-haul applications where weight matters, we recommend aluminum. For severe-duty or construction applications where impact resistance is crucial, steel tanks are often the better choice.

Do I need special tools or professional installation for air tank replacement?

Basic air tank replacement requires standard shop tools including wrenches, air line disconnect tools, and proper jack stands. The process typically takes 2-4 hours per tank. Critical steps include properly depressurizing the system, using thread sealant on all fittings, and performing a leak test after installation. While experienced mechanics can handle this job, we recommend professional installation if you're replacing tank mounting brackets or modifying air line routing, as improper installation can affect braking performance.

What tank wrap options are available, and how do they affect tank performance?

We offer polished stainless steel, chrome-plated, and powder-coated wraps in various colors. Tank wraps are primarily aesthetic but do provide some protection against road debris and minor impacts. They don't affect air capacity or system performance. Installation involves removing the tank, sliding on the wrap, and securing with provided clamps. Note that wraps add approximately 1/4" to the tank diameter, which rarely affects fitment but should be considered in tight installations.

How do I determine the correct air tank capacity for my Peterbilt 388?

Stock Peterbilt 388 models typically use tanks ranging from 1200 to 2500 cubic inches total capacity. The correct size depends on your brake system configuration and intended use. Trucks with additional axles or air-operated accessories need larger capacity. As a general rule, maintain at least the OEM-specified capacity when replacing tanks. Upgrading to larger tanks can improve air recovery time and reduce compressor cycling, but ensure your mounting location has adequate clearance. Check your door jamb sticker or owner's manual for OEM specifications.