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Dorman M39677 Brake Master Cylinder
Brake Master Cylinder for Vanagon
This Dorman brake master cylinder is built for specific Volkswagen Vanagon applications and is engineered to match the original unit’s design, function, and performance. It uses new, high-quality materials and a cast iron body for a durable hydraulic brake replacement.
- Brand: Dorman
- Part number: M39677
- Brake master cylinder for brake hydraulics service
- 0.938 in. bore diameter
- Cast iron master cylinder construction
- Two outlets with M10 x 1.0 rearward outlet thread
- Secondary outlet thread diameter: 10 mm
- Reservoir not included
- Mounting hardware not included
Fitment Details
- Fits 1980-1991 Volkswagen Vanagon, N/A. Notes: Fits 15/16" bore size drum brakes on multiple vehicle models.
For Volkswagen Vanagon brake repair, this master cylinder is a direct replacement choice for restoring hydraulic pressure at the brake pedal. The Dorman M39677 is built to the same general design and outlet layout used on the original master cylinder, making it a practical option when replacing a worn, leaking, or internally bypassing unit. This part cross-references Beck/Arnley 072-8089 and TYC 97071 for the same application.
Common Problems It Can Address
- Low or sinking brake pedal caused by internal master cylinder wear
- Brake fluid leakage from a failing hydraulic housing
- Uneven brake response from pressure loss in the master cylinder
- Brake warning concerns tied to degraded hydraulic performance
- Restoration of proper brake system pressure on Volkswagen Vanagon models
Installation Notes and Tips
Verify bore size, outlet thread size, and reservoir configuration before installation. This unit does not include a reservoir or mounting hardware, so reuse or source the required components as needed. After installation, bleed the brake system thoroughly and confirm a firm pedal before returning the vehicle to service.
Quality Assurance
Dorman manufactures this master cylinder as a new replacement part using high-quality materials and OE-style engineering for the listed Volkswagen Vanagon applications. The cast iron construction and matched outlet configuration support consistent brake hydraulic performance.
| Brand | Dorman |
| Part Number | M39677 |
| Mounting Hardware Included | No |
| Master Cylinder Bore Diameter | 0.938 |
| Master Cylinder Material | Cast iron |
| Reservoir Included | No |
| Secondary Outlet Thread Diameter | 10 |
| Number of Outlets | 2 |
| Package Contents | Master cylinder |
| Rearward Outlet Size | M10 x 1.0 |
| Thread Pitch | 1.0 |
This part fits 12 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1991 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1990 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1989 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1988 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1987 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1986 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1985 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1984 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1983 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1982 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1981 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1980 | Volkswagen | Vanagon | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.