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Raybestos MC39978 Brake Master Cylinder
| Brand | Raybestos MC39978 |
|---|---|
| Mounting Hole Quantity | 2 |
| Master Cylinder Material | Aluminum |
| Mounting Hole Diameter | 0.343 |
| Bore Size | 1.000 |
| Number of Ports | 3 |
| Primary Port Thread A | M10x1 |
| Secondary Port Thread A | M10x1 |
| Product line | Element3; New |
| Fits | Nissan · 5 vehicles |
Aluminum construction. Helps keep the brake master cylinder lightweight and durable.
1.000 bore size. Supports consistent hydraulic response in braking.
Three-port design. Provides the connections needed for brake hydraulic routing.
Cross-references BBB Industries 12884, Cardone New 13-2585 and Centric Parts 130.42315 for the same application. See all 19.
Raybestos MC39978 Brake Master Cylinder
The Raybestos MC39978 is a brake master cylinder for 1991-1995 Nissan Pathfinder applications. Built with an aluminum master cylinder body and a 1.000-inch bore, it supports consistent hydraulic pressure for the brake system in the Pathfinder platform.
Part of the Raybestos Element3 line, this new master cylinder is focused on OE-style fit and hydraulic performance for drivers servicing a 1991-1995 Nissan Pathfinder. The MC39978 uses a 2-hole mounting pattern and three ports with M10x1 primary and secondary port threads.
Key Features
- Brake master cylinder for 1991-1995 Nissan Pathfinder
- Raybestos Element3; New product line
- Aluminum master cylinder construction
- 1.000-inch bore size
- 2 mounting holes with 0.343-inch mounting hole diameter
- 3 ports with M10x1 primary and secondary port threads
- Part number MC39978
Product Details
The MC39978 is a direct-fit brake master cylinder for Nissan Pathfinder models from 1991 through 1995. Its aluminum housing helps keep weight down while maintaining the hydraulic characteristics needed for brake pedal response and system pressure. With a 1.000-inch bore and three-port layout, this unit matches the specifications required for the listed Pathfinder applications. This part cross-references Cardone New 13-2585 for the same application.
Common Brake System Issues It May Address
- Brake pedal travel that feels excessive
- Loss of hydraulic pressure in the brake circuit
- External leakage at the master cylinder body or ports
- Uneven or inconsistent brake pedal response
- Brake warning concerns tied to master cylinder wear
Installation Notes and Tips
Verify port thread size, mounting hole spacing, and bore specification before installation. After replacement, bleed the brake system thoroughly to remove trapped air and confirm a firm pedal. Check all line connections for leaks and confirm proper brake operation before returning the vehicle to service.
Quality Assurance
Raybestos Element3 components are positioned as new replacement parts for service work on the listed vehicle applications. Confirm fitment against the vehicle’s brake system configuration before installation.
| Year | Make | Model | Notes |
|---|---|---|---|
| 1995 | Nissan | Pathfinder | Element3; New |
| 1994 | Nissan | Pathfinder | Element3; New |
| 1993 | Nissan | Pathfinder | Element3; New |
| 1992 | Nissan | Pathfinder | Element3; New |
| 1991 | Nissan | Pathfinder | Element3; New |
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