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Porsche // Panamera 970 MK2 (2014-2016) // Any
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- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
The Genuine Porsche Rear Power Steering Return Line (Part Number: 99634744103) is an original equipment hydraulic steering component designed for selected Porsche 911 (996) models manufactured from the 2002 model year onwards.
Fits:
- Porsche 996 C2 3.6L 2002-2005
- Porsche 996 C4 3.6L 2002-2005
- Porsche 996 C4S 3.6L 2002-2005
Diagram Ref No 9
Manufactured to Porsche's original equipment specifications, this return line forms part of the hydraulic power steering system, providing a passage for power steering fluid to return through the system after assisting the steering mechanism.
Located towards the rear of the vehicle, the pipe forms part of the connection arrangement associated with the engine-driven power steering pump and the fluid return circuit.
The Porsche 996 uses a hydraulic power steering system to reduce the effort required to turn the steering wheel. During operation, the power steering pump circulates hydraulic fluid through the steering system, providing assistance as the driver turns the wheel.
After passing through the hydraulic steering circuit, fluid returns towards the pump and reservoir arrangement. The rear return line helps complete this circulation path.
Correct fluid circulation is essential for maintaining consistent steering assistance, protecting the pump and preventing unnecessary wear to hydraulic system components.
Over time, the original return line may deteriorate due to repeated heat exposure, vibration, corrosion, ageing seals or physical damage. Damaged fittings or pipework can allow hydraulic fluid to escape, potentially reducing the fluid level and affecting the operation of the power steering system.
A leaking or restricted return line may contribute to steering pump noise, fluid loss or inconsistent steering assistance.
Replacing a damaged or leaking rear power steering return line with a Genuine Porsche component helps restore the integrity of the hydraulic circuit, maintain reliable fluid circulation and protect the steering system from avoidable damage.
Ideal for power steering leak repairs, hydraulic system maintenance, engine removal work and specialist Porsche restoration projects, this Genuine Porsche return line provides a factory-specified replacement for compatible Porsche 996 models.
What This Product Does:
The rear power steering return line is an important component of the Porsche 996 hydraulic steering system.
Its primary function is to carry hydraulic fluid through the low-pressure return side of the power steering circuit.
When the engine is running, the power steering pump supplies pressurised fluid to the steering rack. Hydraulic pressure assists the movement of the steering mechanism, reducing the physical effort required from the driver.
After the fluid has passed through the steering system, it returns through the appropriate return pipes towards the pump and reservoir circuit.
The rear return line provides part of this route near the engine and pump assembly.
Its main functions include:
- Returning power steering fluid: Provides a passage for hydraulic fluid travelling back through the steering circuit.
- Supporting continuous fluid circulation: Helps maintain the flow of fluid required for normal power steering operation.
- Maintaining hydraulic system integrity: Provides a sealed connection between the relevant return circuit components.
- Preventing fluid loss: Correctly fitted pipework and seals help contain power steering fluid.
- Supporting consistent steering assistance: Helps maintain the hydraulic fluid supply needed for dependable steering operation.
- Protecting the power steering pump: Supports the fluid circulation conditions required for normal pump operation.
- Maintaining correct fluid routing: Preserves the original rear power steering pipe configuration.
- Reducing contamination risks: Secure connections help prevent external contaminants entering the hydraulic circuit.
- Preserving factory functionality: Maintains Porsche's intended hydraulic steering arrangement.
Symptoms Of Wear Or Failure:
The rear power steering return line is exposed to engine compartment temperatures, hydraulic fluid, vibration and repeated thermal cycling.
Although designed for durability, the pipework and associated connections may deteriorate over time.
Common symptoms of a worn or damaged power steering return line include:
- Visible power steering fluid leaks: Damaged pipework or deteriorated connections may allow hydraulic fluid to escape.
- Fluid stains beneath the vehicle: Leaking fluid may leave visible patches on the ground.
- Oil residue around the rear engine area: Dampness near the return line or its connections may indicate hydraulic fluid seepage.
- Falling power steering fluid level: Continued leakage may cause the reservoir level to decrease.
- Power steering pump whining: Low fluid levels may allow air to enter the hydraulic system, causing pump noise.
- Increased steering effort: Significant fluid loss may reduce available hydraulic steering assistance.
- Intermittent steering assistance: Severe fluid loss or air contamination can contribute to inconsistent steering operation.
- Foaming or aerated fluid: Air entering the system may cause bubbles or foam to appear in the reservoir.
- Visible corrosion: Environmental exposure may weaken metal sections of the return line or its fittings.
- Cracked or damaged hose sections: Where flexible sections are incorporated, ageing and heat may cause deterioration.
- Loose or damaged hydraulic fittings: Worn connections may prevent secure sealing.
- Kinked or crushed pipework: Incorrect routing or physical damage may restrict the intended return flow.
- Damaged mounting brackets: Loose supports may allow vibration and abrasion against surrounding components.
- Burning oil-like smell: Leaking hydraulic fluid contacting hot engine or exhaust surfaces may produce an unpleasant odour.
- Unusual hydraulic system noises: Fluid restriction, aeration or low fluid levels may cause abnormal steering system sounds.
Why Replacement Matters:
Replacing a defective power steering return line is important for maintaining reliable steering assistance and preventing unnecessary hydraulic fluid loss.
A damaged return line may allow fluid to escape from the system, gradually reducing the quantity available for circulation.
If the fluid level becomes too low, the power steering pump may draw in air rather than a consistent supply of hydraulic fluid. This can lead to abnormal pump noise, reduced steering assistance and increased mechanical wear.
A restricted return line may also interfere with normal fluid circulation.
Installing a Genuine Porsche replacement Rear Power Steering Return Line helps to:
- Restore fluid circulation: Maintain the intended hydraulic return path.
- Prevent power steering leaks: Replace damaged pipework and leaking connections.
- Maintain reliable steering assistance: Support the fluid circulation required for consistent hydraulic steering operation.
- Protect the power steering pump: Reduce the risk of pump damage associated with significant fluid loss.
- Reduce abnormal pump noise: Help resolve whining caused by fluid loss from a confirmed leaking return line.
- Maintain hydraulic system integrity: Restore a secure, properly sealed return connection.
- Prevent further fluid contamination: Replace compromised connections that may expose the circuit to contamination.
- Reduce the risk of unexpected steering problems: Address developing leaks before the system loses significant fluid.
- Preserve correct factory routing: Maintain the intended rear engine compartment pipe configuration.
- Support power steering servicing: Provide replacement pipework during pump or associated hydraulic component repairs.
- Prevent damage to surrounding components: Reduce unwanted hydraulic fluid leakage around the engine compartment.
- Maintain vehicle originality: Preserve the factory hydraulic steering arrangement.
- Support long-term reliability: Replace ageing or damaged hydraulic components before deterioration worsens.
- Maintain Genuine Porsche quality: Use an original equipment component intended for the applicable Porsche 996 steering system.
Replacement is particularly recommended when inspection confirms cracking, corrosion, damaged fittings, physical deformation or persistent fluid leakage from the line.
When replacing the rear return line, the adjoining pressure pipe, centre return line, pump connections and associated seals should also be inspected.
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Porsche 991.2 - 2016 to 2019
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For power steering of PDDC hydraulic lines
Click 'Zoom in' for large parts diagram.
Diagram ref no 21
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