Centric 123.43003 Brake Drum - Rear

Centric C-TEK Rear Brake Drum

Centric C-TEK Standard Brake Drums deliver a practical OE-style replacement for rear drum brake service. Part number 123.43003 is built around the dimensions and mounting details needed for select Chevrolet Spectrum, Geo Spectrum, and Isuzu I-Mark rear applications.

The C-TEK brake drum line focuses on the core features buyers expect from a replacement drum: correct fit, consistent friction surface dimensions, and a straightforward hub-and-drum mounting design. For rear brake repair on the Chevrolet Spectrum, Geo Spectrum, and Isuzu I-Mark, 123.43003 provides the dimensional match needed for a proper service replacement.

Key Features

• Centric C-TEK Standard Brake Drums product line
• Part number 123.43003
• Rear brake drum for hub-and-drum mounting
• Nominal drum diameter: 180.000 mm / 7.087 in
• Maximum brake diameter (discard): 181.000 mm / 7.126 in
• Outside diameter: 214.000 mm / 8.425 in
• Friction surface width: 39.240 mm / 1.545 in
• Bolt hole quantity: 4
• Bolt circle diameter: 100.000 mm / 3.937 in
• Hub hole/register: 56.700 mm / 2.232 in
• Height: 69.090 mm / 2.720 in
• Outer cooling fins: No

Product Details

Centric positions the C-TEK brake drum line as a value-focused replacement that carries many of the dimensional and functional features expected in premium replacement parts. This drum is specified for rear use and matches the listed fitment for 1985-1988 Chevrolet Spectrum, 1989 Geo Spectrum, and 1985-1989 Isuzu I-Mark. If you are replacing a worn rear drum on a Chevrolet Spectrum rear brake service or an Isuzu I-Mark rear brake repair, 123.43003 gives you the key measurements to verify before installation.

This part cross-references Bosch 8101 and Raybestos Brakes 8101R for the same application.

Common Problems This Drum Can Address

• Rear brake pulsation caused by an out-of-round or worn drum
• Reduced braking performance from excessive drum wear beyond discard diameter
• Brake shoe contact issues from an incorrect friction surface dimension
• Noise or vibration related to a damaged rear drum surface
• Fitment issues when replacing a drum with the wrong bolt pattern or hub register

Installation Notes and Tips

Confirm the drum diameter, bolt circle, hub hole/register, and mounting style before installation. Measure the existing drum and compare it to the discard diameter of 181.000 mm / 7.126 in to determine whether replacement is required. Clean the hub mounting surface, inspect the rear brake shoes and hardware, and verify even shoe contact after assembly. This rear brake drum is listed for Chevrolet Spectrum, Geo Spectrum, and Isuzu I-Mark applications, so match the vehicle year and position exactly to the fitment data.

Quality Assurance

Centric’s C-TEK Standard Brake Drums are engineered as replacement brake components with the dimensional consistency needed for routine brake service. Part number 123.43003 is specified for the listed rear applications and follows the product line’s OE-style replacement approach.