Centric 123.68003 Brake Drum - Rear

Centric C-TEK Brake Drum 123.68003

Centric C-TEK Standard Brake Drums are built for drivers who need a direct replacement brake drum with OE-style dimensions and consistent braking surface geometry. Part number 123.68003 is a floating-mount brake drum with a 12.520-inch outside diameter and 11.000-inch nominal drum diameter for applications that use a 5-lug, 5.500-inch bolt circle.

Key Features

• Centric C-TEK Standard Brake Drums line for everyday brake service
• Part number 123.68003
• 11.000-inch nominal drum diameter and 11.090-inch maximum brake diameter discard spec
• 12.520-inch outside diameter with 2.760-inch height
• 5 bolt holes, 5.500-inch bolt circle diameter, and 3.010-inch hub hole/register
• 2.120-inch friction surface width for drum brake contact area
• Floating mounting type with no outer cooling fins
• Cross-reference: Haynes 80035

Product Details

The C-TEK Standard Brake Drums line is positioned as a practical replacement option that carries many of the dimensional and performance characteristics expected from premium replacement parts. For brake service on vehicles such as Chevrolet and GMC applications that use this drum size, 123.68003 provides the critical measurements needed for proper drum brake operation, including the mounting hole diameter, hub register, and friction surface width. The Centric 123.68003 brake drum is specified for a 5-lug setup and is sized to match common rear drum brake configurations where accurate fit and stable contact surface geometry matter.

Common Problems This Brake Drum Can Address

• Brake pulsation or uneven rear drum braking caused by worn drum surfaces
• Out-of-spec drum diameter that affects shoe contact and braking consistency
• Grooving, scoring, or heat-related wear on the braking surface
• Noise or vibration from a drum that no longer matches OE dimensions
• Service replacement needs on Chevrolet and GMC rear drum brake applications

Installation Notes

Verify the nominal drum diameter, bolt circle diameter, hub hole/register, and mounting hole diameter before installation. Measure the existing drum and compare it to the maximum brake diameter discard specification of 11.090 inches to confirm serviceability. Clean the hub mounting surface, inspect brake shoes and hardware for wear, and confirm the drum seats evenly before road testing. For fitment-based searches, this part is commonly referenced for Chevrolet and GMC rear drum brake applications using the 123.68003 size profile.

Quality Assurance

Centric markets the C-TEK brake drum line as a replacement solution that incorporates many of the features associated with premium replacement parts. Part number 123.68003 is manufactured to published dimensional specifications to support accurate brake service and repeatable fitment on the intended drum brake applications.