TRW PSA939 Power Brake Booster

Reliable Power Brake Booster for Saab 9-3 and 9-3X

The TRW PSA939 power brake booster is designed as a standard replacement part for Saab 9-3 and 9-3X models. This vacuum booster enhances braking performance by providing consistent pedal assist, ensuring safer and more responsive stops.

• Standard replacement brake service grade
• Vacuum booster type for efficient brake assist
• Steel housing with a 243 mm diameter for durability
• Dual diaphragm design with 243 mm diameter for reliable operation
• Includes gasket and neck seal for proper installation
• Compatible with Saab 9-3 and 9-3X models

Detailed Product Description

The TRW PSA939 power brake booster is engineered with a robust steel housing measuring 243 mm in diameter, providing strength and longevity under demanding conditions. Its dual diaphragm design, also 243 mm in diameter, ensures consistent vacuum assistance to the brake pedal, reducing driver effort and improving braking response. This vacuum-type booster does not include a master cylinder or mounting hardware, but it comes with essential seals and gaskets to maintain system integrity and prevent vacuum leaks. Specifically designed for Saab 9-3 and 9-3X vehicles, this booster meets standard replacement specifications to restore original braking performance.

Common Applications and Problem Resolution

• Restores brake pedal responsiveness in Saab 9-3 and 9-3X
• Eliminates hard brake pedal issues caused by failing boosters
• Prevents vacuum leaks that reduce brake assist efficiency
• Addresses inconsistent braking force and pedal travel
• Replaces worn or damaged brake booster components

Installation Notes and Tips

When installing the TRW PSA939 power brake booster, ensure the vacuum lines are free of cracks or damage to maintain proper vacuum pressure. Since mounting hardware and brake pedal rod extension are not included, retain original components or source compatible parts separately. Use the included gasket and neck seal to prevent vacuum leaks and ensure a secure fit. Proper alignment during installation is critical to avoid brake system malfunctions.

Quality Assurance and Warranty

TRW manufactures the PSA939 power brake booster to meet standard replacement quality requirements. The steel housing and dual diaphragm design provide durability and consistent performance. This part includes essential seals to maintain system integrity. Warranty details should be confirmed with the distributor or manufacturer, as coverage may vary.