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OE Quality
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MPA Electrical NM4259 Brake Master Cylinder
Brake Master Cylinder for Lucerne and DTS
Restore consistent brake pedal response with this new brake master cylinder from MPA Electrical. Built as a standard replacement for vehicles with front disc brakes, Part Number NM4259 is engineered for 2009-2011 Buick Lucerne and 2009-2011 Cadillac DTS applications.
Key Features
- Brand: MPA Electrical
- Part Number: NM4259
- Brake master cylinder for brake hydraulic systems
- 1-inch bore diameter
- Aluminum master cylinder body with plastic reservoir
- Reservoir, cap, and gasket/seal included
- Uses DOT 3 brake fluid
- Standard replacement grade
- New condition
- Fits vehicles with front disc brakes
Product Details
MPA Electrical brake master cylinders are built to restore braking performance using OE sample-based engineering and testing against OE specifications. This NM4259 master cylinder is a direct hydraulic replacement for the Buick Lucerne and Cadillac DTS, with a 2-hole mounting pattern, 1.000-inch bore, aluminum construction, and an integrated plastic reservoir. The unit includes the reservoir cap and gasket or seal, while mounting hardware, brake booster, push rod, sensor, and brake pressure switch are not included. Part Number NM4259 is also cross-referenced to 19418188 and 20943078 for the same application.
What It Helps Fix
- Low or inconsistent brake pedal feel
- Internal master cylinder fluid bypass
- Brake fluid leakage at the master cylinder
- Delayed hydraulic response in the brake system
- Loss of braking performance on Buick Lucerne and Cadillac DTS models
Installation Notes
Before installation, confirm the vehicle uses front disc brakes and verify bore size, mounting hole spacing, and fluid type. Bench bleeding the master cylinder before final installation helps remove trapped air and supports proper pedal feel. Use clean DOT 3 brake fluid and inspect the brake lines, booster interface, and reservoir seals during service. Part Number NM4259 is a fitment-specific replacement for 2009-2011 Buick Lucerne and 2009-2011 Cadillac DTS.
Quality Assurance
MPA Electrical tests each brake master cylinder against OE specifications using proprietary processes and strict protocols to support consistent braking performance out of the box.
| Brand | MPA Electrical |
|---|---|
| Part Number | NM4259 |
| Position | New with front disc brakes |
| Reservoir Material | Plastic |
| Mounting Hardware Included | No |
| Grade Type | Standard replacement |
| Gasket Or Seal Included | Yes |
| Mounting Hole Quantity | 2 |
| Master Cylinder Bore Diameter | 1 |
| Brake Booster Included | No |
| Master Cylinder Cap Included | Yes |
| Master Cylinder Material | Aluminum |
| Push Rod Included | No |
| Reservoir Included | Yes |
| Sensor Included | No |
| Mounting Hole Diameter | 0.346 |
| Mounting Bracket Included | No |
| Brake Pressure Switch(s) Included | No |
| Fluid Type | Dot 3 |
| Product Condition | New |
This part fits 6 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2011 | Buick | Lucerne | N/A | New with front disc brakes |
| 2011 | Cadillac | DTS | N/A | New with front disc brakes |
| 2010 | Buick | Lucerne | N/A | New with front disc brakes |
| 2010 | Cadillac | DTS | N/A | New with front disc brakes |
| 2009 | Buick | Lucerne | N/A | New with front disc brakes |
| 2009 | Cadillac | DTS | N/A | New with front disc brakes |
* 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.