DuraGo BD3812 Brake Drum - Rear

DuraGo BD3812 Rear Brake Drum

The DuraGo BD3812 is a cast iron rear brake drum built for select Volkswagen applications that use a 4-lug, 100 mm bolt circle layout. It is sized for consistent brake surface contact and direct replacement service on rear drum brake systems.

Compatible with rear brake service on Volkswagen Cabriolet, Fox, Golf, Jetta, and Rabbit Convertible applications, this brake drum is manufactured in ISO certified factories to support fit, form, and function requirements. The BD3812 is a practical replacement choice when servicing worn or out-of-spec rear drums on older Volkswagen models.

Key Features

• Part number: BD3812
• Cast iron, full cast construction
• Nominal drum diameter: 180 mm (7.09 in.)
• Maximum brake diameter discard: 181 mm (7.13 in.)
• Outside diameter: 211.5 mm (8.33 in.)
• Brake surface width: 38.5 mm (1.52 in.)
• Overall height: 52.5 mm (2.07 in.)
• 4 bolt holes with 100 mm (3.94 in.) bolt circle diameter
• Bolt size: M12 x 1.5
• Center hole diameter: 56.8 mm (2.24 in.)
• Rear position application
• No rust resistant coating, no ABS tone ring, and no outer cooling fins

Detailed Description

DuraGo BD3812 is a rear brake drum engineered for older Volkswagen drum brake systems that require a 180 mm nominal drum diameter and 4-bolt mounting pattern. The cast iron construction provides the mass and braking surface needed for stable rear brake operation, while the dimensional specs support accurate replacement on vehicles such as the Volkswagen Cabriolet, Volkswagen Fox, Volkswagen Golf, Volkswagen Jetta, and Volkswagen Rabbit Convertible. DuraGo has a long aftermarket manufacturing history, and this brake drum is produced in ISO certified factories to meet fit, form, and function requirements.

This part cross-references Anchor 9107 and Atlantic Automotive Engineering 3812 for the same application. The BD3812 is also referenced by part numbers 97069 and BD97069 in interchange listings.

What This Brake Drum Helps Address

• Rear brake pulsation caused by drum wear or out-of-round surfaces
• Reduced braking consistency from drums that have reached discard diameter
• Brake shoe contact issues from worn drum braking surfaces
• Noise or vibration related to deteriorated rear drum condition
• Service needs on rear drum brake systems for Volkswagen Cabriolet, Fox, Golf, Jetta, and Rabbit Convertible

Installation Notes and Tips

• Verify the drum diameter, bolt circle, center hole, and bolt size before installation.
• Measure the existing drum against the discard diameter specification of 181 mm (7.13 in.).
• Inspect brake shoes, wheel cylinders, and hardware condition during drum replacement.
• Confirm rear-only application before ordering; this part is not listed for front use.
• Check vehicle-specific notes, including the 1989 Volkswagen Golf rear application note of “To 2/89.”

Quality Assurance

DuraGo manufactures this brake drum in ISO certified factories and backs the product line with a focus on catalog accuracy and application coverage for aftermarket brake service. The BD3812 is built to meet the fit, form, and function expectations of professional repair work.