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TRW PSA939 Power Brake Booster
| Brand | TRW PSA939 |
|---|---|
| Brake Service Grade | Standard replacement |
| Booster Type | Vacuum |
| Brake Pedal Rod Extension Included | No |
| Housing Diameter | 243 |
| Diaphragm Type | Dual |
| Master Cylinder Included | No |
| Mounting Hardware Included | No |
| Gasket Or Seal Included | Yes |
| Housing Material | Steel |
| Diaphragm Diameter | 243 |
| Mounting Bracket Included | No |
| Neck Seal Included | Yes |
| Fits | Saab · 9 vehicles |
Standard replacement. Vacuum booster for straightforward brake system service.
Dual-diaphragm design. Delivers consistent assist with a steel housing.
Seal included. Comes with gasket and neck seal for a cleaner install.
Cross-references 32221804, 93172086 and 93175747 for the same application. See all 4.
TRW PSA939 Power Brake Booster for Saab 9-3
The TRW PSA939 is a standard replacement vacuum power brake booster built for select Saab 9-3 and Saab 9-3X applications. It uses a dual-diaphragm design with a 243 mm housing diameter and steel construction to match the original brake assist layout on covered vehicles.
Key Features
- Standard replacement power brake booster
- Vacuum booster type with dual diaphragm design
- 243 mm housing diameter and 243 mm diaphragm diameter
- Steel housing for OE-style fit and structure
- Gasket and neck seal included
- Master cylinder, mounting hardware, mounting bracket, and brake pedal rod extension not included
Detailed Description
TRW PSA939 is a vacuum power brake booster for Saab brake system service where original assist performance needs to be restored. This unit is listed for 2003 Saab 9-3, 2004 Saab 9-3 from chassis/VIN 41005441, 2005-2010 Saab 9-3, and 2010 Saab 9-3X, with OE vendor reference to TRW on the listed applications. It cross-references 32221804 and 93172086 for the same application. If you are searching for a Saab 9-3 brake booster replacement or a TRW PSA939 brake booster for Saab 9-3 models, this part matches the specified fitment and dimensions.
Common Issues This Part May Address
- Reduced brake pedal assist
- Hard brake pedal feel
- Vacuum booster leakage
- Brake assist loss from diaphragm or seal wear
- Brake system performance decline on covered Saab 9-3 and Saab 9-3X vehicles
Installation Notes and Tips
Verify the vehicle year, model, and VIN break before ordering, especially for the 2004 Saab 9-3 application noted from chassis/VIN 41005441. Confirm the existing booster diameter and vacuum booster layout before installation. Transfer or source any required mounting components separately, since mounting hardware and mounting bracket are not included. Replace the booster only after checking the master cylinder, vacuum supply, and brake pedal linkage condition.
Quality Assurance
TRW supplies this as a standard replacement brake component with OE-style specifications for the listed Saab applications. The included gasket and neck seal support proper sealing at installation, and the part is built to the stated housing and diaphragm dimensions for fitment accuracy.
| Year | Make | Model | Submodel | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2010 | Saab | 9-3 | Aero | 2.0L | L4 | N/A | Description: 10 in Dia; OE Vendor:TRW |
| 2010 | Saab | 9-3X | Base | — | — | N/A | Description: 10 in Dia; OE Vendor:TRW |
| 2009 | Saab | 9-3 | — | — | — | N/A | Description: 10 in Dia; OE Vendor:TRW |
| 2008 | Saab | 9-3 | — | — | — | N/A | Description: 10 in Dia; OE Vendor:TRW |
| 2007 | Saab | 9-3 | — | — | — | N/A | Description: 10 in Dia; OE Vendor:TRW |
| 2006 | Saab | 9-3 | — | — | — | N/A | Description: 10 in Dia; OE Vendor:TRW |
| 2005 | Saab | 9-3 | Linear | 2.0L | L4 | N/A | Description: 10 in Dia; OE Vendor:TRW |
| 2004 | Saab | 9-3 | Arc | 2.0L | L4 | N/A | From Chassis/VIN 41005441 |
| 2003 | Saab | 9-3 | Arc | — | — | N/A | Description: 10 in Dia; OE Vendor:TRW |
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