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OE Quality
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MPA Electrical NM55473 Brake Master Cylinder
Brake Master Cylinder for BMW 323i, 328i, 328Ci
Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM55473. It is a standard replacement unit built with an aluminum body, a 0.874 bore diameter, and DOT 4 fluid compatibility for select BMW models with front disc brakes.
Fits 1999 BMW 323i, N/A, and fits 2000 BMW 328i and 2000 BMW 328Ci, N/A. This NM55473 master cylinder is engineered to match OE specifications using tested manufacturing processes for dependable braking performance after installation.
Key Features
- Brand: MPA Electrical
- Part number: NM55473
- Brake master cylinder for brake hydraulics service
- Standard replacement grade
- Aluminum construction
- 0.874 bore diameter
- Gasket or seal included
- DOT 4 fluid type
- Two mounting holes
- New condition
Product Details
The MPA Electrical New with front disc brakes product line focuses on direct-fit brake hydraulic replacement parts for vehicles that need restored pedal feel and hydraulic pressure. This brake master cylinder is built for BMW 323i, BMW 328i, and BMW 328Ci applications listed above, making it a practical choice when the original master cylinder shows wear, internal leakage, or inconsistent brake response. The NM55473 is supplied without a reservoir, booster, push rod, sensor, or pressure switch, so existing vehicle-specific components are retained where applicable.
This part cross-references BMW OE numbers 34311165584 and 34316750642 for the same application.
What It Helps Fix
- Low or spongy brake pedal feel
- Internal master cylinder fluid bypass
- Brake fluid leakage at the cylinder body or seals
- Uneven hydraulic pressure delivery
- Brake response loss caused by a worn master cylinder
Installation Notes and Tips
Verify vehicle fitment by year, model, and brake configuration before installation. Bench bleed the master cylinder before connecting brake lines, then bleed the full hydraulic system with DOT 4 brake fluid to remove trapped air. Inspect the mounting holes, sealing surfaces, and connected brake lines for wear or contamination during replacement.
Quality Assurance
MPA Electrical tests each unit against OE specifications using proprietary processes and strict protocols to help ensure consistent braking performance out of the box. This NM55473 master cylinder is a new standard replacement part built for dependable hydraulic restoration on select BMW 323i, 328i, and 328Ci applications.
| Brand | MPA Electrical |
|---|---|
| Part Number | NM55473 |
| Position | New with front disc brakes |
| Mounting Hardware Included | No |
| Grade Type | Standard replacement |
| Gasket Or Seal Included | Yes |
| Mounting Hole Quantity | 2 |
| Master Cylinder Bore Diameter | 0.874 |
| Brake Booster Included | No |
| Master Cylinder Cap Included | No |
| Master Cylinder Material | Aluminum |
| Push Rod Included | No |
| Reservoir Included | No |
| Sensor Included | No |
| Mounting Hole Diameter | 0.352 |
| Mounting Bracket Included | No |
| Brake Pressure Switch(s) Included | No |
| Fluid Type | Dot 4 |
| Product Condition | New |
This part fits 3 vehicles. Search below:
| Year | Make | Model | Body Type | Position | Notes |
|---|---|---|---|---|---|
| 2000 | BMW | 328Ci | N/A | New with front disc brakes | |
| 2000 | BMW | 328i | N/A | New with front disc brakes | |
| 1999 | BMW | 323i | Sedan | 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.