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Dorman M39793 Brake Master Cylinder
Dorman M39793 Brake Master Cylinder
Dorman M39793 is a brake master cylinder built for specific Nissan applications, including the 1989 Nissan 300ZX and 1987-1988 Nissan 300ZX with 15/16 in. bore drum brake configurations. It is engineered to match the original master cylinder’s design, function, and performance, using new aluminum construction and an included reservoir and sensor.
Key Features
- Direct replacement brake master cylinder for select Nissan vehicles
- 0.938 in. bore diameter for the specified brake system application
- Aluminum master cylinder body for durable service
- Reservoir included for a complete hydraulic assembly
- Sensor included for vehicles equipped with the original sensor setup
- Three outlets for the listed brake circuit configuration
- Rearward outlet size: M10 x 1.0
- Secondary outlet thread diameter: 10 mm with 1.0 thread pitch
Detailed Description
This Dorman brake master cylinder is a precision-engineered replacement for the original unit on select Nissan 300ZX models. The M39793 is built from new, high-quality materials and uses an aluminum housing with a 0.938-inch bore to match the hydraulic requirements of the listed applications. With the reservoir and sensor included, it supports a straightforward replacement of the master cylinder assembly on compatible brake systems.
This part cross-references Beck/Arnley 072-8423 and Centric Parts 130.42502 for the same application. It is also referenced by part number M39793 in catalog listings for the same Nissan brake master cylinder application.
What This Part Helps Address
- Brake pedal travel that feels excessive or inconsistent
- Internal hydraulic leakage in the master cylinder
- Loss of brake pressure at the pedal
- Brake warning light concerns related to the master cylinder sensor circuit
- Restoration of proper hydraulic operation on Nissan 300ZX brake systems
Installation Notes and Tips
Verify bore size, outlet thread sizes, and sensor configuration before installation. This master cylinder does not include mounting hardware. Bench bleeding the unit before installation helps reduce trapped air in the hydraulic system. After installation, bleed the brake system thoroughly and confirm a firm pedal feel before returning the vehicle to service. Confirm fitment for 1989 Nissan 300ZX and 1987-1988 Nissan 300ZX models with the listed 15/16 in. bore drum brake application.
Quality Assurance
Dorman designs this replacement master cylinder to match the original part’s fit, function, and performance on the specified Nissan applications. The use of new materials and application-specific construction supports consistent hydraulic operation for the listed vehicles, including Nissan 300ZX fitment.
| Brand | Dorman |
|---|---|
| Part Number | M39793 |
| Mounting Hardware Included | No |
| Master Cylinder Bore Diameter | 0.938 |
| Master Cylinder Material | Aluminum |
| Reservoir Included | Yes |
| Secondary Outlet Thread Diameter | 10 |
| Sensor Included | Yes |
| Number of Outlets | 3 |
| Package Contents | Master cylinder |
| Rearward Outlet Size | M10 x 1.0 |
| Thread Pitch | 1.0 |
This part fits 3 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1989 | Nissan | 300ZX | N/A | Bore: 15/16 In.; To 2/89 |
| 1988 | Nissan | 300ZX | N/A | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1987 | Nissan | 300ZX | 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.