Fits GM 1967-1977 GM Restoration Cast Iron Master Cylinder MC309
Fits GM 1967-1977 GM Restoration Cast Iron Master Cylinder MC309
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Introducing the GM Restoration Cast Iron Master Cylinder (SKU: MC309)—a premium replacement part engineered to restore the braking performance of classic GM vehicles from 1967 to 1977. This master cylinder is crafted to mirror the original equipment specifications, ensuring both functionality and authenticity for your restoration project.
Key Features:
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Authentic Design: An exact replica of the original GM master cylinder, featuring casting number 5463809 for period accuracy.
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High-Quality Construction: Manufactured from durable cast iron with a natural finish, providing longevity and resistance to wear.
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Integrated Bleeder Valves: Equipped with bleeder valves on the left side ports, facilitating easy air removal during the brake system bleeding process.
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Versatile Application: Suitable for both manual and power brake systems, accommodating various restoration needs.
Item Specifications:
- Part Number: MC309
- Bore Size: 1-1/8 inches
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Port Sizes:
- Front Port: 9/16"-18 inverted flare
- Rear Port: 1/2"-20 inverted flare
- Material: Cast Iron
- Finish: Natural Cast
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Dimensions:
- Length: 8 inches
- Height: 5 inches
- Center Mounting Holes Distance: 3-3/8 inches
- Weight: Approximately 10 lbs
Compatibility:
This master cylinder is suitable for a range of GM vehicles equipped with disc/drum brake systems from 1967 to 1977, including:
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Chevrolet:
- 1967-1969 Camaro
- 1967-1972 Chevelle
- 1967-1977 Corvette
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Pontiac:
- 1967-1969 Firebird
- 1967-1970 GTO
Installation Note:
This master cylinder features a deep bore design and includes a shallow bore adapter, making it compatible with both manual and power brake applications. Ensure compatibility with your vehicle's brake system before installation.
Restore your classic GM vehicle's braking system with the MC309 Master Cylinder, offering authentic design and reliable performance for your vintage automobile.





Policies and FAQs
Return Policy
Fault reasons include but are not limited to:
- Buyer was shipped the wrong product
- Buyer was shipped a damaged product
- The product page had incorrect fitment and the part does not fit the Buyer's vehicle
Opened boxes, plastic bags, and other packaging are not considered damage (excluding single use items such as, but not limited to, liquids, software, and other components that cannot be reused/resealed).
FAQs
|Q. What is an Intermediate Brake Line?
|A. This is the line that runs from the front of the vehicle to the rear. On most vehicles it connects to a junction then you will have rear axle lines. On a few cars the intermediate lines will connect to the rear wheels. It is recommended to change the axle lines if you are replacing the intermediate lines.
|Q. What is included in a pre bent brake line kit?
|A. Our kits include all of the solid metal lines for that section of the vehicle
|Q. I need to return something - what's your return policy?
|A. We are happy to help! Please help us to help you by going to our return form and filling out the form as best as you can in order to request a return.
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Modern Day stands by our parts and is happy to accept returns within 30 days of purchase. Parts must be in new condition.
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If a part arrives damaged, or is defective, Please report it to us immediately. So we can handle it for your promptly.