DuraGo BD8839 Brake Drum - Rear

Overview of DuraGo BD8839 Brake Drum

The DuraGo BD8839 brake drum is engineered for reliable braking performance on select Buick, Chevrolet, GMC, Oldsmobile, and Pontiac vehicles. Designed with a composite construction featuring cast iron and a steel top, this brake drum supports consistent stopping power and durability.

• Composite construction with cast iron and steel top for strength
• Outer cooling fins to aid heat dissipation
• Nominal drum diameter of 241.3 mm (9.5 inches)
• Brake surface width of 62.7 mm (2.47 inches)
• Five bolt holes with a 120.65 mm (4.75 inch) bolt circle diameter
• Overall height of 78.5 mm (3.09 inches)
• Center hole diameter of 70.7 mm (2.78 inches)
• No ABS tone ring included

Detailed Product Description

The DuraGo BD8839 brake drum is constructed from a composite material combining cast iron with a steel top, providing a balance of durability and heat resistance. Its outer cooling fins help dissipate heat generated during braking, reducing the risk of brake fade. The brake drum measures 11.87 inches (301.5 mm) in outside diameter and features a nominal drum diameter of 9.5 inches (241.3 mm), which aligns with factory specifications for compatible vehicles. The brake surface width of 2.47 inches (62.7 mm) ensures adequate contact area for brake shoes, contributing to effective braking performance. This brake drum includes five bolt holes with a bolt circle diameter of 4.75 inches (120.65 mm) and bolt hole diameters of 0.52 inches (13.3 mm), matching OEM fitment requirements. It does not include an ABS tone ring, so it is intended for vehicles without ABS sensor integration on the drum.

Compatible Vehicles and Applications

This brake drum is compatible with a range of GM vehicles, including Buick models like Century, LeSabre, and Regal; Chevrolet models such as Bel Air, Caprice, and Impala; GMC S10 and S15 trucks; Oldsmobile Cutlass and Delta 88; and Pontiac Firebird, Grand Prix, and GTO. The DuraGo BD8839 is suitable for applications requiring a 5-lug brake drum with the specified dimensions and bolt pattern.

Common Issues Addressed by This Brake Drum

• Worn or scored brake drums causing reduced braking efficiency
• Brake drum out-of-roundness leading to brake pulsation
• Overheated drums resulting in brake fade or noise
• Corroded or damaged brake surfaces affecting shoe contact
• Incorrect fitment or damaged bolt holes causing installation issues

Installation Notes and Tips

• Verify vehicle compatibility using make, model, and year before installation
• Inspect brake shoes and hardware for wear and replace if necessary
• Clean mounting surfaces to ensure proper drum seating
• Check brake drum maximum diameter (discard at 243.6 mm / 9.59 inches) to confirm usability
• Torque lug nuts to manufacturer specifications to avoid warping

Quality Assurance and Warranty

DuraGo brake drums are manufactured to meet or exceed OEM standards for fit, form, and function. The BD8839 part number undergoes rigorous quality control to ensure consistent performance and durability. While specific warranty details may vary, DuraGo typically offers limited warranties covering defects in materials and workmanship. Consult product documentation or the supplier for exact warranty terms.