OE Quality
60-Day Returns

Dorman M630823 Brake Master Cylinder
Reliable Brake Master Cylinder Replacement
The Dorman M630823 brake master cylinder is designed to restore proper brake hydraulics for vehicles requiring a 23mm bore diameter. Crafted from durable cast iron, this master cylinder includes a reservoir to ensure consistent brake fluid supply and reliable braking performance.
- Master cylinder bore diameter: 23mm for precise hydraulic pressure
- Constructed from cast iron for strength and durability
- Includes reservoir for brake fluid storage
- Single outlet design with 1/2-20 rearward outlet size
- Package contains the master cylinder unit only
Product Details and Specifications
The Dorman M630823 brake master cylinder is engineered to meet the demands of brake hydraulic systems requiring a 23mm bore diameter. Its cast iron construction provides resistance to wear and corrosion, ensuring long service life. The included reservoir allows for proper brake fluid containment and circulation, critical for maintaining consistent brake pressure. This master cylinder features a single outlet with a rearward outlet size of 1/2-20, compatible with specific brake line fittings. Note that this part does not include mounting hardware or sensors.
Compatible Vehicles and Applications
This brake master cylinder is suitable for vehicles that require a 23mm bore diameter master cylinder with a 1/2-20 rearward outlet. It is commonly used in brake hydraulic systems of various makes and models, including certain Ford and Chevrolet vehicles. When searching for a replacement part, referencing the Dorman part number M630823 will help ensure compatibility with your vehicle’s brake system.
- Restores proper brake pedal feel and hydraulic pressure
- Resolves brake fluid leaks from a worn or damaged master cylinder
- Eliminates spongy or unresponsive brake pedal issues
- Prevents brake system failure due to internal cylinder wear
- Replaces master cylinders with damaged or corroded reservoirs
Installation Notes and Tips
Installation of the Dorman M630823 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal hydraulic function. Verify that the bore diameter and outlet size match your vehicle’s specifications before installation. Use appropriate brake fluid as recommended by the vehicle manufacturer. Since mounting hardware is not included, retain original hardware or source compatible fasteners for secure installation.
Quality Assurance and Warranty
Dorman brake master cylinders are manufactured to meet or exceed OEM standards for fit, form, and function. The M630823 part undergoes rigorous quality control to ensure reliable performance in brake hydraulic systems. Please consult Dorman’s warranty policy for specific coverage details related to this master cylinder.
| Brand | Dorman |
| Part Number | M630823 |
| Mounting Hardware Included | No |
| Master Cylinder Bore Diameter | 23 |
| Master Cylinder Material | Cast iron |
| Reservoir Included | Yes |
| Sensor Included | No |
| Number of Outlets | 1 |
| Package Contents | Master cylinder |
| Rearward Outlet Size | 1/2-20 |
This part fits 0 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|
* 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.