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MPA Electrical B3821 Power Brake Booster
Remanufactured Vacuum Brake Booster for Nissan and INFINITI
MPA Electrical B3821 is a remanufactured vacuum power brake booster built for direct replacement in select Nissan 350Z and INFINITI G35 applications. It is engineered to deliver strong braking assist with reduced pedal effort, helping restore consistent brake feel in daily driving and stop-and-go traffic.
Key Features
- Remanufactured vacuum power brake booster
- Standard replacement brake service grade
- Metal housing construction
- 2 mounting studs with 8x1.25 master cylinder stud thread size
- Master cylinder not included
- Brake pedal rod extension not included
- Gasket or seal not included
- Mounting bracket not included
- Front seal not included
Product Details
The MPA Electrical B3821 brake booster is part of the Reman Vac Pwr Brake Booster w/o Master Cyl product line, focused on vacuum-assisted braking replacement parts. According to MPA Electrical, these boosters use new replacement and specially treated components to improve vacuum sealing, pressure transfer, and overall braking performance. Each unit is 100% end-of-line tested with proprietary equipment before release.
This part cross-references 47210AM425 and 47210CD025 for the same application. It is a direct-fit style replacement for drivers searching for a reman brake booster for 2003 Nissan 350Z, 2005 Nissan 350Z, or 2003-2004 INFINITI G35.
Common Brake Booster Issues It Can Address
- Hard brake pedal feel
- Reduced brake assist from a failing vacuum booster
- Inconsistent pedal response during braking
- Loss of vacuum seal in the booster assembly
- Brake performance concerns tied to worn internal booster components
Installation Notes
Verify the master cylinder is reused or replaced separately, since it is not included with this unit. Confirm the 8x1.25 master cylinder stud thread size, 2-stud mounting layout, and vehicle-specific brake booster dimensions before installation on a Nissan 350Z or INFINITI G35. Inspect related vacuum lines, pedal linkage, and sealing surfaces during service to help ensure proper brake assist after installation.
Quality Assurance
MPA Electrical remanufactures this booster with replacement and specially treated components, then tests every unit at the end of the line using proprietary equipment to confirm performance before shipment.
| Brand | MPA Electrical |
| Part Number | B3821 |
| Position | Reman Vac Pwr Brake Booster w/o Master Cyl |
| Brake Service Grade | Standard replacement |
| Booster Type | Vacuum |
| Brake Pedal Rod Extension Included | No |
| Master Cylinder Included | No |
| Gasket Or Seal Included | No |
| Housing Material | Metal |
| Mounting Bracket Included | No |
| Front Seal Included | No |
| Master Cylinder Stud Thread Size (mm) | 8x1.25 |
| Mounting Stud Quantity | 2 |
| Product Condition | Remanufactured |
This part fits 4 vehicles. Search below:
| Year | Make | Model | Body Type | Drive Type | Position | Notes |
|---|---|---|---|---|---|---|
| 2005 | Nissan | 350Z | Coupe | N/A | Reman Vac Pwr Brake Booster w/o Master Cyl | |
| 2004 | INFINITI | G35 | Sedan | RWD | N/A | Reman Vac Pwr Brake Booster w/o Master Cyl |
| 2003 | INFINITI | G35 | N/A | Reman Vac Pwr Brake Booster w/o Master Cyl | ||
| 2003 | Nissan | 350Z | N/A | Reman Vac Pwr Brake Booster w/o Master Cyl |
* 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.