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Original Porsche Part Genuine Porsche part 99634745025

Code: 99634745025

Genuine Porsche part

Original Porsche Part

Additional information:

• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.

Before purchasing thoroughly check part to confirm compatibility.

Related products

3 3 3

Power Steering Pressure Line, LHD. Porsche 986 Boxster / 996 1999-05

99634745112

Product Information

Power Steering Pressure Line, LHD.
Restore the high-pressure hydraulic path in your power-steering system with this genuine Porsche pressure line. Designed for Porsche 911 (996 series) and compatible Boxster models, this hose connects the power-steering pump to the steering gear/rack, ensuring optimum assist performance, secure fluid containment and long-term reliability.
For Left Hand Drive Cars ONLY!

Fits:

Porsche Boxster 986 2.7L 2003-04
Porsche Boxster 986 2.7L 2003-04
Porsche 996 C2 3.6L 2002-2005
Porsche 996 GT2 2003-05
Porsche 996 GT3 MKI 1999-02
Porsche 996 GT3 MKII 2003>>

Diagram Ref No 1

What This Product Does:

The pressure line carries high-pressure hydraulic fluid from the power-steering pump to the steering gear or rack. This enables the system to provide assist to the driver’s steering input.
Correct hose integrity ensures fluid stays contained under pressure, the steering assist remains consistent, and no performance loss or fluid loss occurs.
A failure here can impact steering feel, safety, and can lead to fluid loss or damage.

Symptoms & Signs You Might Need Replacement:

Visible fluid leak: oil or power-steering fluid puddle or wet spot beneath the car, near the steering gear or hose.
Hard steering or increased effort: If the hose is leaking or collapsed internally, the assist will suffer and you may find the wheel harder to turn.
Whining or groaning noise when turning the steering wheel — indicates stress on the pump due to fluid loss or internal hose restriction.
Hose condition: cracks, abrasions, bulges, fitting damage, especially in older vehicles or where routing is near heat/exhaust components.
During service: If you’re replacing power-steering components (pump, rack, hoses) and the hose is original or aged, replacing the pressure line is wise.

Why Replacement Matters:

Steering safety & performance: A pressure line failure can cause sudden loss of assist or fluid loss — replacing before major failure is proactive.
Prevents collateral damage: A leaking hose may cause fluid contamination of other components, damage the pump, or even cause burnt rubber in the bay.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99634745112

99634745112

99634745109

99634745110

The product you are viewing cross references to these numbers

Power Steering Return Line, LHD. Porsche 986 Boxster / 996 2002-05

99634744911

Product Information

Power Steering Return Line, LHD.
The Genuine Porsche Power Steering Return Line 99634744911 is a replacement hydraulic line for the power-assisted steering system on compatible left-hand-drive (LHD) Porsche vehicles.

Fits:

Porsche Boxster 986 2.7L 2002
Porsche Boxster S 986 3.2L 2002
Porsche Boxster 986 2.7L 2003-04
Porsche Boxster S 986 3.2L 2003-04
Porsche 996 C2 3.6L 02-2005
Porsche 996 C4 3.6L 09/01-2005
Porsche 996 C4S 3.6L 02-2005
Porsche 996 GT2 2002-05
Porsche 996 GT3 MKI 2002
Porsche 996 GT3 MKII 2003>>

Diagram Ref No 2

The return line carries power steering fluid back through the hydraulic system after it has assisted steering operation. Maintaining a sealed and unrestricted return path is essential for correct fluid circulation, consistent steering assistance and protection of the power steering pump and associated components.

As a Genuine Porsche component, this line is manufactured for the intended factory installation and is suitable for replacing an original return line that has become cracked, leaking, corroded or otherwise damaged.

What This Product Does:
A hydraulic power steering system uses pressurised fluid to reduce the amount of effort required to turn the steering wheel.

The power steering pump circulates hydraulic fluid through the system. After the fluid has performed its steering-assistance function, it must return through the system so that it can be recirculated.

The power steering return line provides this return path.

Its functions include:

Returning hydraulic fluid through the power steering system
Maintaining continuous power steering fluid circulation
Helping maintain correct hydraulic system operation
Preventing fluid from escaping from the system
Supporting consistent steering assistance
Helping protect the power steering pump from low-fluid operation

Although the return side generally operates at lower pressure than the main pressure supply line, it must still remain properly sealed and free from restrictions.

Symptoms Of Wear Or Failure:
Power steering lines are exposed to heat, vibration, hydraulic fluid, road contamination and ageing.

Over time, deterioration can result in leaks or restricted fluid flow.

Common symptoms include:

Power steering fluid underneath the vehicle
Visible fluid around the return line
Damp or oily hose connections
Falling power steering fluid level
Frequent need to top up the reservoir
Heavier steering effortIntermittent power steering assistance
Whining or groaning from the power steering pump
Foaming or aeration in the fluid reservoir
Burning smell if fluid reaches hot components
Visible cracking or deterioration of flexible hose sections
Corrosion on metal sections or fittings
Damaged or loose connections

Any unexplained loss of power steering fluid should be investigated promptly.

Why Replacement Matters:
The return line is essential for maintaining a sealed and correctly circulating hydraulic power steering system.

Replacing a damaged or leaking line helps:

Stop power steering fluid loss
Restore correct hydraulic fluid circulation
Maintain consistent steering assistance
Reduce the risk of air entering the system
Protect the power steering pump
Prevent fluid contamination of surrounding components
Restore the reliability of the steering system

Because steering is a safety-critical vehicle system, known hydraulic leaks or damaged lines should be repaired promptly.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99634744911

99634744911

99634744909

99634744910

The product you are viewing cross references to these numbers

Power Steering Pressure Line, LHD. Porsche 986 Boxster / 996 Carrera / Turbo / GT2 / GT3 1997–01

99634745113

Product Information

Power Steering Pressure Line, LHD.

The Porsche Power Steering Pressure Line 99634745113 is a genuine replacement hydraulic line for the power-assisted steering system on selected left-hand-drive Porsche 986 Boxster and 996 models.

Fits:

Porsche Boxster 986 2.5L 1997-99
Porsche Boxster 986 2.7L 1999-01
Porsche Boxster S 986 3.2L 1999-01
Porsche 996 C2 3.4L 1997-08/01
Porsche 996 C4 3.4L 1997-08/01
Porsche 996 C2 3.6L 09/01-2001
Porsche 996 C4 3.6L 09/01-2001
Porsche 996 C4S 3.6L 09/01-2001
Porsche 996 TURBO 2000-01
Porsche 996 GT2 2001-01
Porsche 996 GT3 MKI 1999-01

Diagram Ref No 1

The pressure line carries hydraulic fluid under pressure through the power steering system, helping transfer hydraulic assistance to the steering rack when the steering wheel is turned.

Because the line operates under significant hydraulic pressure, secure fittings and leak-free pipework are essential. This genuine Porsche replacement is suitable for renewing an original pressure line that has become corroded, damaged, cracked or is leaking.

What This Product Does:
The hydraulic power steering system reduces the physical effort required to turn the front wheels.

The power steering pump circulates hydraulic fluid under pressure, while the pressure line carries this fluid towards the steering gear where hydraulic assistance is applied.

Its main functions include:

Carrying pressurised power steering fluid
Supplying hydraulic pressure to the steering system
Supporting power-assisted steering operation
Helping reduce steering effort
Maintaining a sealed hydraulic circuit
Supporting smooth and consistent steering response
Maintaining the correct factory routing between steering components
Preventing hydraulic fluid loss when correctly sealed

The pressure line itself does not generate hydraulic pressure; it safely transfers the pressure produced by the power steering pump.

Symptoms Of Wear Or Failure:
Power steering lines are exposed to hydraulic pressure, engine and road heat, vibration, moisture and ageing.

Common symptoms of a failing pressure line include:

Visible power steering fluid leakage
Wet or oily deposits around the line
Leakage around unions or fittings
Falling power steering fluid level
Fluid stains beneath the vehicle
Steering becoming heavier than normal
Intermittent loss of steering assistance
Whining or groaning from the power steering pump
Noise when turning the steering wheel
Foaming or aeration in the power steering fluid
Cracked or deteriorated flexible hose sections
Corrosion on metal pipe sections
Damaged or distorted pipework
Burning-fluid smell if leaked fluid reaches hot components

Heavy steering or pump noise can also be caused by a failing pump, steering rack or other hydraulic lines, so the complete system should be inspected before replacement.

Why Replacement Matters:
The power steering pressure line must contain hydraulic fluid at substantial operating pressure.

If the line develops a leak, the fluid level can gradually fall and hydraulic assistance may become weaker or inconsistent. A significant leak can eventually result in a noticeable increase in steering effort.

Continued operation with insufficient power steering fluid can also cause the pump to run without adequate lubrication and cooling, potentially resulting in expensive pump damage.

A deteriorated pressure line can also fail suddenly, causing rapid fluid loss.

Replacing a leaking or damaged pressure line helps restore:

Correct hydraulic pressure
Reliable power-assisted steering
Consistent steering effort
A sealed power steering circuit
Correct fluid circulation
Protection of the power steering pump and steering rack
Factory-correct line routing and connections

Addressing a small leak early can therefore help prevent damage to more expensive steering components.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99634745113

99634745111

99634745108

99634745113

The product you are viewing cross references to these numbers

Power Steering Pressure Hose, Rear. Porsche 996 Turbo / GT2 / GT3 2000–05

99634744354

Product Information

Genuine Porsche rear pressure hose for the power steering system on selected 996 Turbo, GT2 and GT3 vehicles, 2000–05. Part number 99634744354 provides a replacement for the pump-side hydraulic connection.

Fits

Porsche 996 Turbo 2000–05
Porsche 996 GT2 2000–05
Porsche 996 GT3 2000–05

Supplied model-family identification: 996 (911) (1997-2005). This broader identification does not establish suitability for every 996 variant.

Before ordering, confirm compatibility using the vehicle model, production year, engine and applicable part references.

What This Product Does

Hydraulic pressure from the steering pump passes through this hose into the steering circuit. Its role is to carry the fluid within a sealed connection so the system can provide steering assistance. It is a pressure hose, rather than a return pipe or fluid cooler.

Functions

Routes pressurised fluid from the pump towards the steering system.
Provides the hydraulic connection at the rear pump position.
Retains fluid within the pressure-side connection.

Technical Details

Brand: genuine Porsche.
Product reference: 99634744354.
Position: Rear, at the power steering pump.
Listed applications: 996 Turbo, GT2 and GT3, 2000–05.
Earlier part references: 99634744352 and 99634744353.
Approximate weight: 0.236 kg.

Symptoms of Fault

Fluid collecting underneath the car.
Wet patches at hose joints or crimped ends.
Pump whining accompanied by a falling fluid level.
Increased effort when turning the steering wheel.
Visible hose cracks, rubbing damage or ageing.

These signs are not exclusive to this hose. Inspect the hydraulic circuit to identify the source before replacing components.

Why Replacement Matters

A leaking pressure connection can reduce the fluid supply available for steering assistance. Renewing a damaged hose addresses that leak and restores the intended fluid path. During the repair, examine adjacent pipework and connection seals, and check the remaining hoses for deterioration. Route the replacement correctly without twisting it; contaminated fluid should also be addressed.

OE Reference

99634744354
99634744353
99634744352

FAQs

When should the hydraulic circuit be flushed?
Flushing is advisable if the fluid is contaminated or its condition indicates renewal is needed. Follow the applicable service procedure.

Which seals should be fitted?
Fit replacement O-rings or sealing washers where required by the connection specification.

Does changing this hose require wheel alignment?
Replacing only the hydraulic hose does not usually change wheel geometry. An alignment check may be appropriate if other steering or suspension parts are disturbed.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99634744354

99634744354

The product you are viewing cross references to these numbers

Power Steering Centre Pressure Line. Porsche 996 Carrera 2 / Carrera 4 / Carrera 4S 1997-05

99634744527

Product Information

Power Steering Centre Pressure Line.

The Genuine Porsche Power Steering Centre Pressure Line is a replacement hydraulic pipe for the power-assisted steering system of selected Porsche 911 (996) models.

Fits:

Porsche 996 C2 3.4L 1997-08/01
Porsche 996 C4 3.4L 1997-08/01
Porsche 996 C2 3.6L 09/01-2005
Porsche 996 C4 3.6L 09/01-2005
Porsche 996 C4S 3.6L 09/01-2005

Diagram Ref No 6

Located in the centre section of the power steering hydraulic circuit, the line carries pressurised power steering fluid between sections of the system. Hydraulic pressure generated by the power steering pump is used by the steering rack to reduce the effort required to turn the front wheels, particularly at low speeds and during parking manoeuvres.

Because this line operates under hydraulic pressure, it must remain securely sealed and free from corrosion, cracks, deformation or damaged connections. A leaking or restricted pressure line can reduce the effectiveness of the power steering system and may eventually lead to fluid loss, pump damage or reduced steering assistance.

What This Product Does:

Carries pressurised hydraulic fluid through the power steering system.
Forms the centre section of the power steering pressure circuit.
Connects adjoining sections of the hydraulic pipework.
Allows hydraulic pressure to reach the steering system correctly.
Supports light and consistent steering assistance.
Helps maintain correct power steering fluid circulation.
Provides a sealed hydraulic connection under operating pressure.
Replaces a leaking, corroded, damaged or restricted original pressure line.
Helps protect the steering pump and rack by maintaining the correct fluid supply.
Restores hydraulic-system integrity after age-related deterioration or damage.

The power steering system relies on a closed hydraulic circuit. Loss of fluid or pressure anywhere in that circuit can affect steering assistance and place additional stress on other components.

Symptoms Of Wear Or Failure:
Possible symptoms include:

Power steering fluid leaking underneath the vehicle.
Damp or oily residue along the hydraulic pipe.
Fluid collecting around pipe unions or connections.
Gradual reduction in the power steering fluid level.
Steering becoming heavier than normal.
Intermittent loss of steering assistance.
Whining or groaning noises from the power steering pump.
Increased pump noise when turning the steering wheel.
Foaming or aeration of the power steering fluid.
Steering assistance feeling inconsistent.
Corrosion or rust on the metal pipe.
Cracked or damaged hose sections or joints.
Damaged, flattened or kinked sections of pipe.
Fluid spraying or leaking under pressure in severe cases.
Burning-fluid smell if leaked hydraulic fluid reaches hot components.

A low fluid level or noisy steering pump should be investigated promptly. Similar symptoms can also be caused by the pump, reservoir, steering rack, return lines or other hydraulic connections.

Why Replacement Matters:
The power steering pressure line operates under considerably higher pressure than the return side of the system.

If the line begins leaking, fluid loss can reduce the hydraulic pressure available to assist the steering. As the fluid level falls, the pump may begin drawing air into the system, which can result in noise, poor assistance and accelerated pump wear.

Replacing a damaged pressure line helps restore:

A sealed hydraulic circuit.
Correct power steering fluid pressure.
Consistent steering assistance.
Smooth steering operation.
Correct fluid circulation.
Reduced risk of power steering pump damage.
Reliable long-term operation of the steering system.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99634744527

99634744527

99634744526

The product you are viewing cross references to these numbers

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Original Porsche Part Genuine Porsche part 99634745025