Introduction
This manual provides essential information for the installation, operation, maintenance, and troubleshooting of your Dorman M630950 Brake Master Cylinder. This precision-engineered component is designed to match the design, function, and performance of the original master cylinder on specific Ford and Lincoln vehicle models, ensuring a safe and durable replacement.
Applicable Vehicle Models:
- Ford Fusion: 2013, 2014, 2015, 2016
- Lincoln MKZ: 2013, 2014, 2015, 2016
Product Overview
Key Features
- Precise Replacement: Cylinder housing constructed to match the casting material of the original part for similar performance.
- Durable Design: All rubber components are made of high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% New: Made entirely of new materials, not remanufactured, to ensure highest quality and safety.
- Strict Specifications: Manufactured to meet rigorous SAE International standards.
What's in the Box
- 1 - Master Cylinder
Product Images
Installation Guide
Installation of a brake master cylinder requires mechanical expertise and proper tools. If you are not confident in your ability to perform this repair, it is recommended to seek professional assistance. Always refer to your vehicle's specific service manual for detailed instructions and safety precautions.
General Installation Steps:
- Preparation: Ensure the vehicle is safely supported on jack stands. Disconnect the negative battery terminal. Place a drain pan under the master cylinder to catch fluid.
- Fluid Removal: Use a turkey baster or fluid evacuator to remove as much brake fluid as possible from the master cylinder reservoir.
- Disconnect Brake Lines: Carefully loosen and remove the brake lines connected to the master cylinder. Be prepared for fluid leakage. Cap the lines to prevent contamination and excessive fluid loss.
- Remove Mounting Nuts: Locate and remove the mounting nuts that secure the master cylinder to the brake booster.
- Remove Old Master Cylinder: Gently pull the old master cylinder away from the brake booster.
- Bench Bleeding (Crucial Step): Before installing the new master cylinder, it is critical to bench bleed it. This involves filling the reservoir with new brake fluid and using bleed screws or fittings to expel air from the master cylinder's internal chambers. Follow the specific instructions provided with your new Dorman master cylinder for proper bench bleeding.
- Installation of New Master Cylinder: Carefully position the new master cylinder onto the brake booster studs. Ensure the pushrod is correctly seated. Tighten the mounting nuts to the manufacturer's specified torque.
- Reconnect Brake Lines: Reconnect the brake lines to the new master cylinder. Tighten fittings securely, but do not overtighten.
- Fill Reservoir: Fill the master cylinder reservoir with new, clean brake fluid to the MAX line.
- Bleed Brake System: Perform a full brake system bleed to remove any air introduced during the installation process. Start with the wheel furthest from the master cylinder and work your way closer.
- Test Brakes: With the engine off, pump the brake pedal several times to build pressure. The pedal should feel firm. Start the engine and re-test. Perform a low-speed test drive in a safe area to confirm proper brake function before normal operation.
For a detailed visual guide, you may refer to the official Installation Manual (PDF) provided by Dorman.
Operation
The brake master cylinder is a critical component of your vehicle's hydraulic braking system. When the brake pedal is pressed, the master cylinder converts the mechanical force from your foot into hydraulic pressure. This pressure is then transmitted through the brake lines to the calipers (disc brakes) or wheel cylinders (drum brakes), forcing the brake pads or shoes against the rotors or drums, respectively, to slow or stop the vehicle.
The Dorman M630950 is designed to provide consistent and reliable hydraulic pressure, ensuring effective and safe braking performance for compatible Ford and Lincoln models.
Maintenance
Proper maintenance of your brake system, including the master cylinder, is essential for safety and longevity.
- Brake Fluid Level: Regularly check the brake fluid level in the master cylinder reservoir. It should be between the MIN and MAX lines. A consistently low level may indicate a leak in the system and should be investigated immediately.
- Brake Fluid Condition: Brake fluid can absorb moisture over time, which reduces its effectiveness and can lead to corrosion. Consult your vehicle's service manual for recommended brake fluid flush intervals (typically every 2-3 years).
- Fluid Type: Always use the type of brake fluid specified by your vehicle manufacturer (e.g., DOT 3, DOT 4). Mixing fluid types or using incorrect fluid can damage the system.
- Inspect for Leaks: Periodically inspect the master cylinder and surrounding areas for any signs of brake fluid leaks. Look for wet spots or drips.
- Pedal Feel: Pay attention to your brake pedal feel. A spongy or soft pedal, or a pedal that slowly sinks to the floor, can indicate air in the system or a failing master cylinder.
Troubleshooting
If you experience issues with your braking system after installing or while using the Dorman M63090 Brake Master Cylinder, consider the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Soft or Spongy Brake Pedal | Air in the brake lines; improper bench bleeding; low brake fluid. | Re-bleed the entire brake system thoroughly. Check fluid level and top off if necessary. Ensure proper bench bleeding was performed. |
| Brake Pedal Sinks to Floor Slowly | Internal leak in master cylinder (fluid bypassing seals); external leak in system. | Inspect master cylinder for external leaks. If no external leaks, the master cylinder may be faulty and require replacement. Check entire brake system for leaks. |
| Brake Fluid Level Drops Consistently | Leak in brake lines, calipers, wheel cylinders, or master cylinder. | Thoroughly inspect the entire brake system for leaks. Repair or replace any leaking components. |
| Brakes Dragging or Not Releasing | Master cylinder not allowing fluid to return; seized caliper/wheel cylinder; collapsed brake hose. | Check master cylinder for proper piston return. Inspect calipers/wheel cylinders for proper function. Check brake hoses for blockages or collapse. |
If troubleshooting steps do not resolve the issue, it is recommended to consult a certified automotive technician.
Specifications
| Specification | Detail |
|---|---|
| Manufacturer | Dorman Products |
| Brand | Dorman |
| Item Weight | 1.78 pounds |
| Product Dimensions | 14 x 9.2 x 6.4 inches |
| Item Model Number | M630950 |
| Manufacturer Part Number | M630950 |
| OEM Part Number | 10-4646; 130.61147; MC391493; DG9Z 2140-A |
| Date First Available | January 5, 2018 |
Warranty and Support
Dorman products are manufactured to high-quality standards. For specific warranty information regarding your M630950 Brake Master Cylinder, please refer to the documentation included with your purchase or visit the official Dorman website.
For technical support, product inquiries, or warranty claims, please contact Dorman customer service directly. You can find more information and contact details on the official Dorman Brand Store: