Power Steering Pressure Line, LHD. Porsche 986 Boxster / 996 Carrera / Turbo / GT2 / GT3 1997–01  ❭  99634745113

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.

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