Available – １ In Stock
Rebuilt Power Steering Pump Price: From JPY 55,000
Product Details
| Quality | Rebuilt in Japan using a genuine core |
| Product Contents | – Power Steering Pump Assembly – Gaskets for High-Pressure Hose Connection |
| SUBARU IMPREZA | Model: GDB WRX STI: Blobeye |
| Genuine Part Number | 34430FG040 34430FG041 |
| Year | 2003/04 |
| Applied Models | GDBC4EH |
| Engine | 2.0L EMPI DOHC |
| Mission | 6MT |
| Drive train | 4WD |
| Classification | 10747-0011 |
The parts supplied by Auto Parts Box Japan are products that have undergone strict quality control by Japanese companies and possess the following features:
- Reliability – Rebuilt in Japan Using Genuine/OEM Cores.
- High Quality – Rigorous inspections and meticulous quality control.
- Durability – Providing consistent performance and peace of mind.
- Cost-Effective – Providing assured quality at a lower price compared to purchasing new parts, helping you save on your budget.
How to Check Compatibility
If you do not know the part number, please provide your vehicle’s chassis number, and we will help verify the compatible parts for your car.
Regarding Auto Parts
For more details on the rebuilt parts supplied by Auto Parts Box Japan, please see the following pages:
Types of Auto Parts
Rebuilt Parts
Contact Us
Feel free to contact us with any questions or service requests.
Power Steering Pump Overhaul – Recommended Hose Replacement
On older vehicles, when overhauling the power steering pump, we recommend replacing the hoses at the same time.
Hoses are prone to age-related wear such as hardening and cracking, and the clamping force of the clamps may also deteriorate over time.
Even if there were no leaks before, it is not uncommon for power steering fluid to start seeping from the hoses after the final inspection or test run. This often occurs because the process of removing and reinstalling the hoses can put additional stress on aged components, leading to seepage after reassembly.
Note: For some models, hoses may already be discontinued. Please feel free to contact us for availability.
Power Steering Pump: Basic Functions and Common Problems
A detailed explanation of the power steering pump’s role, structure, and common signs of malfunction is available at the link below.
Please feel free to take a look if you’re interested.
Common Power Steering Pump Problems
- Fluid Leaks
- Unusual Noise or Fluid Foaming (Cavitation)
- Heavy Steering Feel
Power Steering Pump FAQ
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What does a power steering pump do?
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The power steering pump generates hydraulic pressure to assist the driver in turning the steering wheel more easily. It supplies pressurized fluid to the power steering rack, reducing steering effort—especially at low speeds.
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What are the symptoms of a failing power steering pump?
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Common signs include:
- Whining or groaning noises when turning the steering wheel
- Leaking power steering fluid
- Heavier-than-usual steering
- Fluid foaming in the reservoir
- Jerky or inconsistent steering response
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What causes a power steering pump to fail?
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Possible causes include:
- Worn internal components (vanes, bearings, seals)
- Contaminated or low fluid
- Faulty flow control valve
- Loose or worn power steering belt
- Problems with the steering rack
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Should I replace my alternator with a used, rebuilt, or brand-new unit?
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Each option has its pros and cons:
- Used Power Steering Pump:
Affordable, but condition and lifespan are uncertain. Internal wear may not be visible, and there’s no guarantee how long it will last. Best suited for short-term use or temporary fixes. - Rebuilt Power Steering Pump:
A cost-effective and reliable option when rebuilt by professionals using genuine components. It’s fully inspected, worn parts are replaced, and performance is restored. Ideal for those seeking quality and savings. - Brand-New Power Steering Pump:
Offers maximum reliability and warranty coverage, but typically comes at a higher price. Best for those prioritizing long-term peace of mind and minimal downtime.
- Used Power Steering Pump:
Customizable Overhaul Kits
You can customize the contents of each kit to suit your preferences.
Prices on our website are slightly lower than on eBay, as there are no additional marketplace fees.
You’re welcome to choose whichever option is more convenient — the product and quality remain the same.
How Rally, Autocross, and Hillclimb Driving Stress the Power Steering Pump
Frequent and Rapid Steering Input
- Continuous steering corrections:
Rally, autocross, and hillclimb events involve tight corners, slaloms, and quick transitions. Drivers often make rapid steering inputs to maintain control at high speed or to set up for the next obstacle.
This forces the power steering pump to operate at high pressure for extended periods, placing greater strain on the system compared to normal driving. - Quick countersteering and adjustments:
On loose surfaces (gravel, snow) or during sudden traction changes, countersteering and quick steering corrections are essential.
These sharp, high-frequency inputs generate momentary spikes in hydraulic load on both the pump and steering rack.
High Tire Grip Variations and Steering Kickback
- Uneven surfaces and lateral slip:
Rally and rallycross often take place on mixed or rough surfaces, while autocross and hillclimb are typically on tarmac. Sudden grip changes or side slip generate strong forces that kick back into the steering system. - Increased steering resistance:
During these motorsports, tires frequently operate at extreme slip angles or experience high grip conditions.
The power steering system must constantly overcome this resistance, demanding higher hydraulic pressure.
Fluid Overheating and Degradation
- Pump overheating:
Extended high-load operation, especially in low-speed technical sections, causes power steering fluid temperature to rise rapidly. - Fluid foaming (cavitation):
As temperature increases, fluid viscosity drops. Under heavy pump load, this can lead to cavitation, forming air bubbles within the fluid.
Since air is compressible, this results in unstable hydraulic pressure and may temporarily reduce steering assist. - Reservoir overflow:
Foaming can increase fluid volume, causing overflow from the reservoir.
If fluid comes into contact with hot engine components, it can pose a safety hazard.
Loss of fluid may also lead to pump starvation or even failure due to overheating.
Maintaining Your Power Steering System
High-performance driving inevitably puts extra stress on the power steering system of your Subaru Impreza.
To prevent unexpected pump failure, noise, or fluid leaks during competition, regular inspection and timely overhaul are essential.