Frequently Asked Questions About Peterbilt 352 Drum Brake Parts
Will these drum brake parts fit my specific year Peterbilt 352?
Most of our drum brake components are designed to fit Peterbilt 352 models from 1969-1980. However, there were mid-year production changes that can affect compatibility. We recommend checking your OEM and axle configuration before ordering. Common variations include 15" x 4" shoes for standard applications and 16.5" x 7" for heavy-duty setups. If you're unsure, our team can help verify fitment with your truck's serial number and brake specifications.
What's the difference between standard and heavy-duty brake shoes, and which do I need?
Standard brake shoes typically feature 4720 or 4707 friction material and work well for highway and moderate hauling applications. Heavy-duty shoes use 4709 or 4719 material with higher heat resistance, ideal for severe service, mountain driving, or heavy loads. Check your current shoe marking or measure the width - standard shoes are usually 4-5 inches wide, while heavy-duty are 6-7 inches. Your application and gross vehicle weight rating will determine the best choice.
Can I replace just the brake shoes, or should I do a complete drum brake overhaul?
While you can replace just the shoes, we strongly recommend inspecting all components when you have the drums off. Check drum diameter (maximum service limit is typically stamped on the drum) Brake hardware kits are relatively inexpensive and prevent comebacks. If drums measure close to maximum diameter or show heat checking, scoring, or out-of-round conditions exceeding 0.015", replacement is necessary for safe, effective braking.
What tools and expertise do I need to install these drum brake parts myself?
Basic installation requires brake spring pliers, drum pullers, a brake adjustment tool, and standard hand tools. Critical steps include proper shoe-to-drum clearance adjustment (typically 0.015-0.020"), correct spring placement, and proper break-in procedures. Many customers find the self-adjuster mechanisms challenging - they must be installed on the correct side and properly engaged. If you lack experience with heavy truck brakes, professional installation is recommended as improper assembly can cause brake failure.
How do I know if I need Q or Q+ brake shoes, and what about cam brake conversions?
Q brake shoes have a single anchor pin and roller, while Q+ shoes feature extended service pins and increased lining material. Check your existing shoes or slack adjuster type - Q+ became standard on most 352s after 1975. For cam brake conversions (S-cam systems), you'll need different shoes entirely, plus backing plates, chambers, and slack adjusters. These conversions offer better performance but require significant investment and modification. Original Q-type systems work fine when properly maintained with quality parts.
