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Raybestos MC39809 Brake Master Cylinder
| Brand | Raybestos MC39809 |
|---|---|
| Mounting Hole Quantity | 2 |
| Master Cylinder Material | Aluminum |
| Mounting Hole Diameter | 0.413 |
| Bore Size | 1.060 |
| Number of Ports | 2 |
| Primary Port Thread A | 9/16"-18 |
| Secondary Port Thread A | 1/2"-20 |
| Product line | Element3; New |
| Fits | Jeep · 4 vehicles |
Aluminum construction. Helps reduce weight without sacrificing strength.
Dual-port design. Supports clean hydraulic line connections.
Brake master cylinder. Converts pedal force into hydraulic pressure.
Cross-references Cardone New 13-1678, Centric Parts 130.67004 and Dorman - First Stop M39809 for the same application. See all 23.
Raybestos MC39809 Brake Master Cylinder
The Raybestos Element3 New MC39809 is a brake master cylinder built for specific Jeep drum brake applications. It features an aluminum body, a 1.060 bore size, and two ports with 9/16"-18 primary and 1/2"-20 secondary thread sizes for the listed fitments.
For Jeep CJ5 and Jeep CJ7 owners restoring or servicing 1977-1978 drum brake systems, this Raybestos master cylinder provides the correct hydraulic configuration for the application. The Element3 New line focuses on replacement parts for direct-fit brake service, and MC39809 is specified for 11" x 2" drum brake systems on the vehicles listed below.
Key Features
- Brake master cylinder for brake hydraulics service
- Aluminum master cylinder material for reduced weight
- 1.060 bore size
- Two mounting holes with 0.413 mounting hole diameter
- Two ports with 9/16"-18 primary port thread and 1/2"-20 secondary port thread
- Raybestos Element3 New product line
- Part number MC39809
Vehicle Fitment
- Fits 1977-1978 Jeep CJ5, N/A. Compatible with 11" x 2" drum brake systems.
- Fits 1977-1978 Jeep CJ7, N/A. Compatible with 11" x 2" drum brake systems.
What This Part Helps Address
- Brake pedal travel caused by a worn master cylinder
- Internal hydraulic leakage in the brake system
- Loss of consistent brake pressure
- Fluid bypass that affects braking response
- Service replacement needs for Jeep CJ5 and Jeep CJ7 drum brake setups
Installation Notes and Tips
Verify bore size, port thread sizes, and mounting hole spacing before installation. This master cylinder is listed for 1977-1978 Jeep CJ5 and CJ7 models with 11" x 2" drum brake systems, so confirm your vehicle’s brake configuration matches the application before ordering. Proper bleeding of the brake system is required after installation.
Quality Assurance
Raybestos Element3 New brake components are cataloged for direct replacement applications, and MC39809 is identified by the manufacturer specifications above for the listed Jeep fitments. This part cross-references Cardone New 13-1678 and Dorman - First Stop M39809 for the same application.
| Year | Make | Model | Notes |
|---|---|---|---|
| 1978 | Jeep | CJ5 | Compatible with 11" x 2" drum brake systems.; Element3; New |
| 1978 | Jeep | CJ7 | Compatible with 11" x 2" drum brake systems.; Element3; New |
| 1977 | Jeep | CJ5 | Compatible with 11" x 2" drum brake systems.; Element3; New |
| 1977 | Jeep | CJ7 | Compatible with 11" x 2" drum brake systems.; Element3; New |
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