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Dorman M39780 Brake Master Cylinder
Overview of Dorman Brake Master Cylinder M39780
The Dorman Brake Master Cylinder M39780 is designed specifically for Honda Civic, Civic del Sol, and CRX models. This brake hydraulics component features an aluminum construction and includes a reservoir and sensor to ensure reliable brake system performance.
- Compatible with Honda Civic, Civic del Sol, and CRX
- Master cylinder bore diameter: 0.813 inches
- Durable aluminum master cylinder material
- Includes reservoir and sensor for integrated functionality
- Two outlets with rearward outlet size M10 x 1.0 and thread pitch 1.0
- Secondary outlet thread diameter: 10 mm
- Mounting hardware not included
Detailed Product Description
The Dorman M39780 brake master cylinder is engineered to meet the specifications required by Honda Civic, Civic del Sol, and CRX vehicles. Constructed from aluminum, this master cylinder offers corrosion resistance and strength necessary for consistent brake fluid pressure. The included reservoir allows for proper fluid storage and monitoring, while the integrated sensor supports brake system diagnostics. With a bore diameter of 0.813 inches and two outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, this part ensures compatibility with the vehicle’s brake hydraulics system. The secondary outlet thread diameter of 10 mm further supports proper brake line connections.
Common Applications and Issues Addressed
- Restores proper brake fluid pressure in Honda Civic, Civic del Sol, and CRX models
- Replaces worn or leaking master cylinders causing brake pedal sponginess
- Solves brake fluid reservoir leaks or sensor malfunctions
- Addresses brake system failures related to master cylinder bore wear
- Improves brake responsiveness and safety by ensuring hydraulic integrity
Installation Notes and Tips
- Ensure brake system is fully depressurized before removal
- Bleed brake lines thoroughly after installation to remove air
- Verify sensor connections are secure for proper brake system monitoring
- Use compatible brake fluid as specified by the vehicle manufacturer
- Mounting hardware is not included; reuse existing hardware or source separately
Quality Assurance and Warranty
Dorman brake master cylinders are manufactured to meet or exceed OEM standards for fit, form, and function. The M39780 part undergoes rigorous quality control to ensure durability and performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.
| Brand | Dorman |
|---|---|
| Part Number | M39780 |
| Master Cylinder Bore Diameter | 0.813 |
| Master Cylinder Material | Aluminum |
| Mounting Hardware Included | No |
| Number of Outlets | 2 |
| Package Contents | Master Cylinder |
| Rearward Outlet Size | M10 X 1.0 |
| Reservoir Included | Yes |
| Secondary Outlet Thread Diameter | 10 |
| Sensor Included | Yes |
| Thread Pitch | 1.0 |
This part fits 37 vehicles. Search below:
| Year | Make | Model | Submodel | Body Type | Drive Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 1997 | Honda | Civic del Sol | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||||
| 1996 | Honda | Civic del Sol | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||||
| 1995 | Honda | Civic | LX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1995 | Honda | Civic | CX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1995 | Honda | Civic | DX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1995 | Honda | Civic | Si | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1995 | Honda | Civic | VX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1995 | Honda | Civic del Sol | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||||
| 1994 | Honda | Civic | LX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1994 | Honda | Civic | CX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1994 | Honda | Civic | DX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1994 | Honda | Civic | Si | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1994 | Honda | Civic | VX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1994 | Honda | Civic del Sol | 1.5L | L4 | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||
| 1993 | Honda | Civic | LX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1993 | Honda | Civic | CX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1993 | Honda | Civic | DX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1993 | Honda | Civic | Si | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1993 | Honda | Civic | VX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1993 | Honda | Civic del Sol | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||||
| 1992 | Honda | Civic | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||||
| 1991 | Honda | Civic | Sedan | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1991 | Honda | Civic | Wagon | FWD | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||
| 1991 | Honda | CRX | Base | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1991 | Honda | CRX | HF | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1990 | Honda | Civic | Sedan | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1990 | Honda | Civic | Wagon | FWD | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||
| 1990 | Honda | CRX | Base | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1990 | Honda | CRX | HF | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1989 | Honda | Civic | Sedan | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1989 | Honda | Civic | Wagon | FWD | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||
| 1989 | Honda | Civic | Hatchback | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1989 | Honda | CRX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||||
| 1988 | Honda | Civic | Sedan | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1988 | Honda | Civic | Wagon | FWD | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | |||
| 1988 | Honda | Civic | Hatchback | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. | ||||
| 1988 | Honda | CRX | N/A | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. |
* 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.