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Porsche 991 (911) MK1 2012-2016 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16 Engine Rebuild Parts Air Intake & Injection

Hoses / Pipes / Sleeves

Hoses / Pipes / Sleeves

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Vacuum Line With Coupling - 5x1x160. Porsche 991.1 Carrera 2012-2016 - 99918148240
3
Vacuum Line With Coupling - 5x1x160. Porsche 991.1 Carrera 2012-2016
Special Order item
99918148240
Product Information
Product Information
Vacuum line with coupling - 5,0 x 1,0 x 160.

Fits:
Porsche 991.1 Carrera 2012-16

Diagram ref. 10.

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Related, superseded, cross reference or alternative numbers for comparison.

99918148240
99918148240

The product you are viewing cross references to these numbers
Vacuum Line. Porsche 991.1 Carrera / GTS / Turbo / 991.2 Turbo / GT2 RS - 9A111005523, 9A111005522
3
Vacuum Line. Porsche 991.1 Carrera / GTS / Turbo / 991.2 Turbo / GT2 RS
Special Order item
9A111005523
Product Information
Product Information

Vacuum Line.
The Genuine Porsche Vacuum Line 9A111005523 is an original replacement vacuum pipe used within the brake-servo vacuum system of selected Porsche 911 991-generation models.

Fits:

  • Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
  • Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
  • Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
  • Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
  • Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
  • Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
  • Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19  

Diagram Ref No 13

The line works with the engine-driven vacuum pump to provide the vacuum required by the brake booster, also known as the brake servo.

Brake assistance allows the driver's pedal input to be multiplied so that strong braking force can be achieved without excessive pedal effort.

Because modern Porsche engines cannot always provide a consistent level of intake-manifold vacuum under every operating condition, a dedicated vacuum pump is used to maintain reliable brake-servo assistance. The vacuum line provides the sealed connection required to transfer this vacuum through the system.

Age, engine-bay heat, vibration and repeated thermal cycling can eventually cause vacuum lines, seals and connections to deteriorate. A leak can reduce available brake assistance and may result in a noticeably harder brake pedal.

Replacing a damaged or leaking vacuum line helps restore the sealed vacuum circuit and maintain reliable power-assisted braking.

What This Product Does:
The vacuum line forms part of the connection between the brake-servo vacuum pump and the vehicle's brake-assistance vacuum circuit.

Its main functions are to:

  • Carry vacuum generated by the vacuum pump.
  • Maintain a sealed vacuum circuit.
  • Support correct brake-servo operation.
  • Help maintain normal brake-pedal effort.
  • Provide consistent power-assisted braking.
  • Accommodate engine movement and vibration.
  • Prevent atmospheric air leaking into the vacuum system.
  • Maintain reliable operation under different engine loads.

Symptoms Of Wear Or Failure:
Possible symptoms include:

  • Brake pedal feeling harder than normal.
  • Increased effort required to stop the vehicle.
  • Reduced power assistance.
  • Brake pedal becoming hard after repeated applications.
  • Hissing from the engine or vacuum-line area.
  • Visible cracks in the vacuum pipe.
  • Split hose sections.
  • Loose or damaged connectors.
  • Damaged O-ring seals.
  • Vacuum line becoming brittle.
  • Vacuum line becoming distorted by heat.
  • Reduced stored brake assistance after the engine is switched off.
  • Changes in brake-pedal feel.

Why Replacement Matters:
Replacing a cracked, leaking or damaged Vacuum Line helps restore:

  • Correct brake-servo vacuum.
  • Normal brake-pedal assistance.
  • Consistent pedal effort.
  • Reliable vacuum retention.
  • Correct vacuum-pump operation.
  • Airtight system integrity.
  • Predictable braking response.

A properly sealed vacuum system is essential for maintaining the brake performance characteristics intended by Porsche.



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

9A111005523
9A111005523
9A111005522

The product you are viewing cross references to these numbers
DISPLAYING 1 to 2 (of 2 products)
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About Hoses / Pipes / Sleeves

Air Inlet Hoses, Pipes & Sleeves – Durable Intake Components for Porsche Performance

Air inlet hoses, pipes, and sleeves are essential components of your Porsche’s intake system, connecting the air filter housing, throttle body, turbocharger, and intercooler. They ensure a smooth and sealed flow of air into the engine, supporting efficient combustion, responsive acceleration, and consistent performance.

At Design911, we supply a full range of genuine and high-quality air inlet hoses, pipes, and sleeves for numerous Porsche models that include 911, Boxster, Cayman, Cayenne, Macan, and Panamera models. Each component is engineered for precision fitment, heat resistance, and airflow stability — helping your Porsche deliver the performance and reliability it’s known for.

What Do Air Inlet Hoses, Pipes & Sleeves Do?

These components channel filtered air through the intake system to the engine’s combustion chambers. Their main functions include:

  • Maintaining airtight airflow between intake components.
  • Reducing turbulence and air loss for improved throttle response.
  • Supporting optimal air pressure for turbocharged and naturally aspirated engines.
  • Protecting against contaminants that can reduce performance or cause engine wear.

In turbocharged Porsche models, these parts also help manage boost pressure, making them crucial to both efficiency and power delivery.

Why Do Air Inlet Hoses, Pipes & Sleeves Fail?

Due to their constant exposure to heat, vibration, and engine movement, air inlet components can deteriorate over time. Common causes of failure include:

  • Cracking or splitting from heat cycles and material fatigue.
  • Oil or fuel vapor contamination softening the rubber or plastic.
  • Loose or damaged clamps causing vacuum or boost leaks.
  • Age-related hardening leading to brittle connections.
  • Excessive boost pressure stressing the hose in performance applications.

Symptoms of failure include hissing or whistling noises, loss of boost pressure, poor throttle response, rough idling, or a check engine light caused by airflow irregularities.

Why Replace Worn Air Inlet Components?

A leaking or damaged inlet hose can cause unmetered air to enter the engine, resulting in incorrect fuel-air ratios, poor performance, or even turbocharger strain. Replacing worn or cracked hoses and pipes ensures proper airflow, efficient combustion, and reliable performance.

Benefits of replacement include:

  • Restored air pressure and engine response.
  • Improved turbo efficiency and power delivery.
  • Enhanced fuel economy and reduced emissions.
  • Long-term reliability with manufacturer-quality materials.

All hoses, pipes, and sleeves available at Design911 are crafted from high-temperature silicone, reinforced rubber, or aluminium alloys for superior sealing, flexibility, and strength — ensuring dependable performance under demanding conditions.

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