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Hoses / Pipes / Sleeves
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
This Genuine Porsche vacuum hose is used on Porsche 928 models within the intake/vacuum hose system and is associated with the brake booster vacuum circuit.
Fits:
Porsche 928 S4 1987 – 1991
Porsche 928 GT 1989 – 1991
Porsche 928 GTS 1992 – 1995
Diagram ref no 12
This hose is commonly described as the hose from the left intake side cover to the brake venturi “Y”.
Functions
• Routes vacuum through the engine intake/vacuum system
• Supports correct brake booster vacuum supply
• Helps maintain proper vacuum assistance for the braking system
• Connects the left intake side cover area to the brake venturi “Y” connection
• Helps prevent vacuum leaks that can affect idle quality and engine running
• Maintains correct factory hose routing and fitment
• Replaces aged, brittle, cracked or leaking original vacuum hose
• Provides OE Porsche fitment for the 928 vacuum system.
Why Replace This Part?
Vacuum hoses become brittle, cracked, hardened or loose with age and heat exposure. A leaking vacuum hose can allow unmetered air into the system, which may cause rough idle, poor running, hesitation or reduced brake booster vacuum performance. Replacing the original hose with a Genuine Porsche OE vacuum hose helps restore the correct vacuum circuit, supports brake booster assistance and keeps the engine vacuum system operating as intended.
When to Replace This Part
• If the hose is cracked, brittle, split or hardened
• If there is a vacuum leak or hissing noise
• If the engine has rough idle or poor running caused by unmetered air
• If brake assistance feels reduced or inconsistent
• During intake, vacuum system or brake booster vacuum repairs
• During engine bay restoration or preventative maintenance
• When replacing old, non-original or incorrectly routed vacuum hose
• Before recommissioning a Porsche 928 that has been stored long-term.
Where It Fits on the Car
This hose fits in the engine bay vacuum system of the Porsche 928. It is associated with the LH-Jetronic intake hose system and connects the left intake side cover area to the brake venturi “Y” / brake booster vacuum circuit. Parts diagrams show this hose as diagram reference no. 12 in the LH-Jetronic hose section.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92811022001
The product you are viewing cross references to these numbers
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
This OE Match vacuum hose / brake booster line is a replacement engine bay vacuum hose for Porsche 928 models from 1987 to 1995. It is associated with the LH-Jetronic intake hose system and is designed to match the original-style fitment and function within the brake booster vacuum circuit.
Fits:
Porsche 928 S4 1987 – 1991
Porsche 928 GT 1989 – 1991
Porsche 928 GTS 1992 – 1995
Diagram ref no 12
The hose carries vacuum from the engine intake system to the brake booster vacuum circuit. It connects the left intake side cover area to the brake venturi “Y” / brake booster vacuum line arrangement, helping maintain the vacuum supply required for brake servo assistance and correct vacuum system operation.
Functions
• Connects the left intake side cover area to the brake venturi “Y” / brake booster vacuum circuit
• Carries engine vacuum through the engine bay vacuum system
• Supports brake booster / brake servo vacuum supply
• Helps maintain correct vacuum pressure in the brake assist circuit
• Supports reliable brake pedal assistance
• Replaces cracked, split, hardened, or leaking original vacuum hoses
• OE Match replacement for Porsche 928 vacuum and brake booster system repair.
Why Replace This Part?
Vacuum hoses can become hard, brittle, cracked, loose, or split due to heat, age, engine bay conditions, and long-term vacuum load. A damaged brake booster vacuum hose can cause vacuum leaks, poor brake servo assistance, rough idle, running issues, or faults in connected vacuum-controlled systems. Replacing the hose helps restore proper sealing, reliable vacuum supply, and safe brake assist function.
When to Replace This Part
• The vacuum hose is cracked, split, brittle, or perished
• The hose is loose or no longer seals correctly
• Vacuum leaks are suspected in the engine bay
• Brake pedal assistance feels reduced or inconsistent
• The brake booster / servo vacuum circuit is being repaired
• The LH-Jetronic intake hose system is being serviced
• The vehicle is undergoing Porsche 928 engine bay or braking system restoration.
Where it fits on the car
This hose fits in the engine bay vacuum system of the Porsche 928. It is associated with the LH-Jetronic intake hose system and connects the left intake side cover area to the brake venturi “Y” / brake booster vacuum circuit.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92811022001
The product you are viewing cross references to these numbers
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.
