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Raybestos MC661 Brake Master Cylinder
| Brand | Raybestos MC661 |
|---|---|
| Mounting Hole Quantity | 3 |
| Master Cylinder Material | Iron |
| Mounting Hole Diameter | 0.413 |
| Bore Size | 1.500 |
| Number of Ports | 3 |
| Primary Port Thread A | 1/2"-20 |
| Fits | —19 vehicles |
OE direct replacement. Brake master cylinder for straightforward installation.
Iron construction. Provides durable hydraulic performance.
1.500-inch bore. Delivers consistent brake pressure response.
Cross-references Autobest F1348, BBB Industries 11119 and Centric Parts 130.83002 for the same application. See all 43.
Raybestos MC661 Brake Master Cylinder
The Raybestos Element3 MC661 brake master cylinder is built for hydraulic brake system service where bore size, port layout, and mounting pattern must match the original application. With a 1.500-inch bore, iron construction, and three mounting holes, it is a direct-fit style replacement for select brake master cylinder applications.
Raybestos Element3 is the brand line focused on brake system components engineered for consistent pedal response and dependable hydraulic performance. For shoppers searching brake master cylinder replacement for Chevrolet C/K, GMC C/K, or similar truck and SUV applications, MC661 is a relevant OE-style part number to verify against the vehicle’s original specifications.
Key Features
- Brake master cylinder, Raybestos Element3 line
- Part number: MC661
- 1.500-inch bore size for hydraulic pressure delivery
- Iron master cylinder body for durable brake system service
- 3 mounting holes with 0.413-inch mounting hole diameter
- 3 ports with 1/2"-20 primary port thread
Detailed Description
The Raybestos MC661 master cylinder is specified with a 1.500-inch bore, iron housing, three mounting holes, and three ports, making it important to confirm the original master cylinder dimensions before ordering. This part number is commonly searched for brake master cylinder replacement on Chevrolet C/K and GMC C/K truck and SUV brake systems, where correct port threading and mounting geometry are critical for proper hydraulic connection.
MC661 also cross-references Dorman - First Stop M661 for the same application. Additional interchange references include Raybestos Brakes MC661 and Centric Parts 130.83002.
Common Brake Issues This Part May Address
- Low or inconsistent brake pedal feel caused by internal master cylinder wear
- Brake fluid leakage at the master cylinder body or ports
- Uneven hydraulic pressure distribution in the brake system
- Pedal travel that increases as internal seals deteriorate
- Brake warning concerns tied to master cylinder failure
Installation Notes and Tips
Verify bore size, mounting hole quantity, mounting hole diameter, port count, and primary port thread before installation. Confirm the vehicle’s original brake line routing and port locations to avoid thread mismatch or hydraulic connection issues. After installation, bleed the brake system thoroughly and inspect all connections for leaks before returning the vehicle to service.
Quality Assurance
Raybestos Element3 brake components are built for brake system service where fit, hydraulic dimensions, and material selection matter. Always confirm application details against the vehicle’s original master cylinder specifications for Chevrolet C/K, GMC C/K, and other listed interchange applications.
| Year | Make | Model | Notes |
|---|---|---|---|
| 1983 | International | 1654 | 1 1/2" Bore Diameter; Single Hydraulic System; Element3; New |
| 1983 | International | 1824 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1983 | International | S1853 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1982 | International | 1824 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1982 | International | S1624 | 1 1/2" Bore Diameter; Single Hydraulic System; Element3; New |
| 1982 | International | S1823 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1982 | International | S1853 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1981 | International | 1654 | 1 1/2" Bore Diameter; Single Hydraulic System; Element3; New |
| 1981 | International | 1824 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1981 | International | S1624 | 1 1/2" Bore Diameter; Single Hydraulic System; Element3; New |
| 1981 | International | S1823 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1981 | International | S1853 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1980 | International | 1824 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1980 | International | S1624 | 1 1/2" Bore Diameter; Single Hydraulic System; Element3; New |
| 1980 | International | S1823 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1980 | International | S1824 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1979 | International | 1824 | 1 1/2" Bore Diameter; Single Hydraulic System; with 15 IN Brakes; Element3; New |
| 1957 | International | CO180 | Element3; New |
| 1956 | International | CO180 | Element3; New |
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