Frequently Asked Questions About Freightliner Century 112/120 CAC Clamps, Boots & Hoses

Will these CAC components fit my specific Freightliner Century model year?

Our CAC clamps, boots, and hoses are designed to fit Freightliner Century Class 112 and 120 models from 1996-2010. However, there can be variations depending on your engine type (Detroit, Caterpillar, or Cummins) and whether you have a stock or aftermarket charge air cooler system. We recommend checking your existing hose diameter and clamp size before ordering, as some mid-year production changes occurred. Most standard applications use 3" to 4" diameter hoses with corresponding clamp sizes.

What's the difference between standard rubber and silicone CAC hoses, and which should I choose?

Standard rubber hoses typically last 2-3 years under normal conditions and handle temperatures up to 250?F. Silicone hoses can withstand temperatures up to 350?F and generally last 5-7 years, making them ideal for high-performance applications or frequent heavy hauling. Silicone also maintains flexibility in extreme cold better than rubber. While silicone costs more upfront, many drivers find the extended lifespan and improved temperature resistance worth the investment, especially if you're already dealing with boost pressure issues.

What size clamps do I need, and are stainless steel clamps really necessary?

Most Century 112/120 CAC connections require either 3.5" or 4" clamps, but always measure your hose OD to confirm. Stainless steel T-bolt clamps are strongly recommended over standard worm-gear clamps because they provide more uniform pressure distribution and won't loosen from vibration as easily. They're particularly important if you're running higher boost pressures (above 30 psi) or have experienced blown boots in the past. The constant torque spring-loaded clamps are even better for maintaining consistent pressure through temperature cycles.

How difficult is it to replace CAC boots and hoses myself?

Replacing CAC components is a straightforward job that most drivers can complete in 30-60 minutes with basic hand tools. The main challenges are accessing tight spaces near the firewall and ensuring proper alignment to avoid kinks. You'll need to remove the air filter housing for better access on most models. Pro tip: mark the orientation of angled boots before removal and use a small amount of dish soap on the inside of new boots for easier installation. Make sure to torque clamps to 50-60 inch-pounds to prevent over-tightening.

How can I tell if my CAC boots are failing before they blow out completely?

Check for soft spots, bulging, or small cracks in the rubber during pre-trip inspections - these are early warning signs. Oil residue on the outside of boots indicates internal degradation from oil vapor exposure. If you notice decreased fuel economy, black smoke under acceleration, or slower turbo spool-up, you may have small leaks that aren't visible. We recommend replacing boots every 3-4 years as preventive maintenance, or immediately if you see any oil seepage or hear whistling sounds under boost.