Hoses / Pipes / Sleeves

Breather hose from air flow sensor boot "T" Fitting
This original Porsche breather hose forms part of the engine intake / crankcase ventilation system, helping route breather vapours correctly while maintaining the correct sealed connection in the intake system.

Fits:
Porsche 928 S4 / GT 1987 - 1991
 * Engine code: 2841 / 2842 / 2847

Porsche 928 GTS 1992 - 1995
 * Engine code: 2849 / 2850

Diagram ref no 27

This hose replaces the earlier Porsche part numbers 92811043201 and 92811043202.

What This Part Does / Functions
•  Routes crankcase breather vapours through the correct intake system path
•  Connects from the air flow sensor boot “T” fitting where specified
•  Helps maintain a sealed intake and breather system
•  Supports correct engine ventilation
•  Helps prevent unmetered air leaks in the intake system
•  Replaces a cracked, hardened, split or oil-softened original hose
•  Provides correct OE Porsche hose shape, fitment and connection size
•  Helps maintain smooth idle quality and correct engine running.

Why Replace This Part?
Breather hoses are exposed to heat, oil vapour, engine movement, age and intake vacuum. Over time, the rubber can harden, crack, collapse, split or become oil-contaminated. A damaged breather hose may allow air leaks, vapour leaks or poor crankcase ventilation, which can affect idle quality and engine performance. Replacing it with an OE Genuine Porsche breather hose helps restore the correct factory intake and ventilation layout on the Porsche 928.

Common Symptoms of a Faulty Breather Hose
•   Cracked, hardened or split rubber hose
•   Oil vapour smell from the engine bay
•   Poor idle quality
•   Intake air leak or vacuum leak
•   Engine hesitation or rough running
•   Loose or damaged connection at the “T” fitting
•   Collapsed or softened hose from age and oil vapour
•   Hose damage found during intake system service.

When to Replace This Part
•   If the original hose is cracked, brittle, split or leaking
•   During intake boot or air flow sensor boot replacement
•   When servicing the crankcase breather / ventilation system
•   If an intake air leak is traced to the breather hose
•   During engine bay restoration
•   When replacing aged rubber hoses on a Porsche 928
•   If the hose is oil-softened, loose or no longer sealing correctly
•   When restoring the intake system with OE Genuine Porsche parts.

Where It Fits on the Car
This breather hose fits in the engine intake / crankcase ventilation area of the Porsche 928. It is fitted from the air flow sensor boot “T” fitting and forms part of the engine breather hose routing.

 Correct installation is important to ensure the intake system remains sealed and the breather system functions as intended.

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

92811043203

The product you are viewing cross references to these numbers

Breather hose from air flow sensor boot "T" Fitting
OE Match breather hose from the air flow sensor boot “T” fitting for Porsche 928 models from 1987 to 1995. This replacement hose helps maintain correct crankcase ventilation and intake breather routing, supporting smooth engine running and proper air intake system operation.

Fits:
Porsche 928 S4 / GT 1987 - 1991
 * Engine code: 2841 / 2842 / 2847

Porsche 928 GTS 1992 - 1995
 * Engine code: 2849 / 2850

Diagram ref no 27

The breather hose routes crankcase vapours and ventilation flow through the intake system. A correctly fitted hose helps maintain proper air metering, reduce vacuum leaks, and prevent unmetered air from entering the intake tract.

Functions
• Replaces the breather hose from the air flow sensor boot “T” fitting
•  Supports correct crankcase ventilation routing
•  Helps maintain proper intake air metering
•  Helps prevent vacuum leaks and unmetered air entry
•  Supports smooth idle and reliable throttle response
•  Suitable for intake system service, breather repair, or engine restoration
•  OE Match replacement for Porsche 928 intake and breather system maintenance

Why Replace This Part?
Breather hoses can harden, crack, split, collapse, or become oil-soaked due to age, heat, oil vapour exposure, and engine bay conditions. A damaged hose may cause rough idle, poor running, vacuum leaks, intake air leaks, oil vapour smell, or incorrect air flow sensor readings. Replacing the hose helps restore correct breather system sealing and intake performance.

When to Replace This Part
•  Breather hose is cracked, brittle, split, collapsed, or leaking
•  Rough idle, hesitation, or poor running is present
•  Vacuum leak symptoms are detected
•  Oil vapour smell or residue is visible around the hose
•  Air flow sensor boot or intake system service is being carried out
•  Engine breather system maintenance is in progress
•  Vehicle is undergoing Porsche 928 restoration or engine bay refresh

Where it fits on the car
This hose fits in the engine intake and breather system, running from the air flow sensor boot “T” fitting on Porsche 928 models.

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

92811043203

The product you are viewing cross references to these numbers

Clamp  D1 20x15   – Multi-Position Clamp 

High-quality D1 20x15 clamp designed for securing various components across Porsche 924S, 944, 928, 964, and 993 models.

This versatile clamp is used in multiple applications including bonnet release cables (924S / 944), expansion tank hoses (944), engine wiring loom (928 S4), injection vacuum hoses (964), and brake reservoir connections (993).

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97
• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

Diagram ref no 24  

Manufactured to OEM specifications, this clamp ensures secure fitment, durability, and resistance to corrosion. Supplied individually, it is ideal for maintenance, repair, or restoration across multiple Porsche systems.

Key Features

• Clamp size D1 20x15
• Suitable for Porsche 964S, 944, 928, 964, and 993
• Part number 99951117701
• Multi-use: cables, hoses, wiring looms, vacuum lines
• Ensures secure mounting and routing
• Prevents vibration-related wear and movement
• Durable and corrosion-resistant construction
• OEM-style fit and performance
• Sold individually

Function and Purpose

This clamp is designed to secure a wide range of components.

It helps to:
• Hold cables, hoses, and wiring looms in place
• Maintain correct routing and alignment
• Prevent vibration-related wear or damage
• Protect sensitive systems such as wiring and vacuum lines
• Ensure long-term reliability across multiple systems

Why Replace Clamps

Clamps can degrade over time due to heat and environmental exposure.

Common issues include:
• Loss of clamping strength
• Corrosion or fatigue
• Movement of hoses, cables, or wiring
• Increased risk of system wear or failure

Replacing worn clamps ensures proper securing and protects critical components.

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

99951117701

The product you are viewing cross references to these numbers

Clamp  D1 20x15   – Multi-Position Clamp 

High-quality D1 20x15 clamp designed for securing various components across Porsche 924S, 944, 928, 964, and 993 models.

This versatile clamp is used in multiple applications including bonnet release cables (924S / 944), expansion tank hoses (944), engine wiring loom (928 S4), injection vacuum hoses (964), and brake reservoir connections (993).

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97
• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988
• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

Diagram ref no 24  

Manufactured to OEM specifications, this clamp ensures secure fitment, durability, and resistance to corrosion. Supplied individually, it is ideal for maintenance, repair, or restoration across multiple Porsche systems.

Key Features

• Clamp size D1 20x15
• Suitable for Porsche 964S, 944, 928, 964, and 993
• Part number 99951117701
• Multi-use: cables, hoses, wiring looms, vacuum lines
• Ensures secure mounting and routing
• Prevents vibration-related wear and movement
• Durable and corrosion-resistant construction
• OEM-style fit and performance
• Sold individually

Function and Purpose

This clamp is designed to secure a wide range of components.

It helps to:
• Hold cables, hoses, and wiring looms in place
• Maintain correct routing and alignment
• Prevent vibration-related wear or damage
• Protect sensitive systems such as wiring and vacuum lines
• Ensure long-term reliability across multiple systems

Why Replace Clamps

Clamps can degrade over time due to heat and environmental exposure.

Common issues include:
• Loss of clamping strength
• Corrosion or fatigue
• Movement of hoses, cables, or wiring
• Increased risk of system wear or failure

Replacing worn clamps ensures proper securing and protects critical components.

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

99951117701

The product you are viewing cross references to these numbers

Engine crankcase breather hose.
Plenum to MAFS Connector.

Fits:
Porsche 928 S4 / GT 1987 - 1991
 * Engine code: 2841 / 2842 / 2847

Porsche 928 GTS 1992 - 1995
 * Engine code: 2849 / 2850

Diagram ref no 11

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

92811017409

The product you are viewing cross references to these numbers

Engine crankcase breather hose, Plenum to MAFS Connector.
OE Match engine crankcase breather hose for Porsche 928 S4, GT, and GTS models from 1987 to 1995. This replacement hose runs from the plenum to the MAFS connector, helping maintain correct crankcase ventilation, intake sealing, and smooth engine operation.

Fits:
Porsche 928 S4 / GT 1987 - 1991
 * Engine code: 2841 / 2842 / 2847

Porsche 928 GTS 1992 - 1995
 * Engine code: 2849 / 2850

Diagram ref no 11

The crankcase breather hose routes crankcase vapours from the engine ventilation system into the intake system for controlled recirculation. A correctly sealed hose helps prevent vacuum leaks, unmetered air entry, oil vapour escape, and poor running caused by damaged or split breather hoses.

Functions
•  Replaces the engine crankcase breather hose
•  Fits from the plenum to the MAFS connector
•  Supports correct crankcase ventilation routing
•  Helps maintain intake system sealing
•  Helps prevent vacuum leaks and unmetered air entry
•  Supports smooth idle, throttle response, and reliable engine running
•  Suitable for intake service, breather system repair, or engine bay restoration
•  OE Match replacement for Porsche 928 S4, GT, and GTS breather system maintenance.

Why Replace This Part?
Crankcase breather hoses can harden, crack, split, collapse, or become oil-soaked due to age, heat, oil vapour exposure, and engine bay conditions. A damaged hose may cause rough idle, hesitation, vacuum leaks, intake air leaks, oil vapour smell, oil mist residue, or incorrect air metering. Replacing the hose helps restore correct breather system function and intake performance.

When to Replace This Part
•   Breather hose is cracked, brittle, split, collapsed, or leaking
•   Rough idle, hesitation, or poor running is present
•   Vacuum leak or unmetered air symptoms are detected
•   Oil vapour smell or oily residue is visible around the hose
•   Plenum, MAFS connector, or intake system service is being carried out
•   Engine crankcase breather system maintenance is in progress
•   Vehicle is undergoing Porsche 928 engine bay restoration or refresh.

Where it fits on the car
This hose fits within the engine intake and crankcase breather system, running from the plenum to the MAFS connector on Porsche 928 S4, GT, and GTS models.

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

92811017409

The product you are viewing cross references to these numbers

Hose 8 x 14mm Wastegate, Warm Up Regulator & Coolant Expansion Tank
Sold per metre

High-quality hose designed for multiple Porsche applications, including the warm-up regulator (WUR) and turbocharger wastegate systems on the Porsche 911, as well as the coolant expansion bottle on the Porsche 928.

This versatile hose supports both fuel/air control systems and coolant circulation, making it an essential component for maintaining proper engine performance, boost control, and cooling system efficiency.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 928 4.5L 1978-82
• Porsche 928S 4.7L 1981-83
• Porsche 928S2 4.7L 1984-86
• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

Diagram ref no 16 and 46  

Supplied per metre, this hose allows precise length replacement and flexible routing, making it ideal for maintenance, repair, or restoration of Porsche engine bay systems. Manufactured to OEM specifications for durability and reliable performance.

Key Features

• 8mm internal diameter, 14mm outer diameter
• Suitable for Porsche 911 and Porsche 928
• Part number 99918170950
• Multi-use: WUR, wastegate, and coolant expansion systems
• Sold per metre for custom length applications
• Resistant to heat, pressure, and fluid exposure
• Flexible and durable construction
• OEM-style fit and performance

Function and Purpose

This hose is used across several critical systems.

It helps to:
• Supply air or pressure signals to the warm-up regulator (WUR)
• Support turbocharger wastegate operation and boost control
• Transport coolant to/from the expansion bottle (928)
• Maintain system pressure and fluid flow
• Ensure reliable engine and turbo performance

Why Replace Hoses

Hoses degrade over time due to heat, pressure, and fluid exposure.

Common issues include:
• Cracking or splitting
• Boost or vacuum leaks affecting performance
• Coolant leaks leading to overheating
• Hardening and reduced flexibility

Replacing worn hoses ensures safe operation and restores system efficiency.

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

99918170950

The product you are viewing cross references to these numbers

Hose 8 x 14mm Wastegate, Warm Up Regulator & Coolant Expansion Tank
Sold per metre

High-quality hose designed for multiple Porsche applications, including the warm-up regulator (WUR) and turbocharger wastegate systems on the Porsche 911, as well as the coolant expansion bottle on the Porsche 928.

This versatile hose supports both fuel/air control systems and coolant circulation, making it an essential component for maintaining proper engine performance, boost control, and cooling system efficiency.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 928 4.5L 1978-82
• Porsche 928S 4.7L 1981-83
• Porsche 928S2 4.7L 1984-86
• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

Diagram ref no 16 and 46  

Supplied per metre, this hose allows precise length replacement and flexible routing, making it ideal for maintenance, repair, or restoration of Porsche engine bay systems. Manufactured to OEM specifications for durability and reliable performance.

Key Features

• 8mm internal diameter, 14mm outer diameter
• Suitable for Porsche 911 and Porsche 928
• Part number 99918170950
• Multi-use: WUR, wastegate, and coolant expansion systems
• Sold per metre for custom length applications
• Resistant to heat, pressure, and fluid exposure
• Flexible and durable construction
• OEM-style fit and performance

Function and Purpose

This hose is used across several critical systems.

It helps to:
• Supply air or pressure signals to the warm-up regulator (WUR)
• Support turbocharger wastegate operation and boost control
• Transport coolant to/from the expansion bottle (928)
• Maintain system pressure and fluid flow
• Ensure reliable engine and turbo performance

Why Replace Hoses

Hoses degrade over time due to heat, pressure, and fluid exposure.

Common issues include:
• Cracking or splitting
• Boost or vacuum leaks affecting performance
• Coolant leaks leading to overheating
• Hardening and reduced flexibility

Replacing worn hoses ensures safe operation and restores system efficiency.

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

99918170950

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Hose clamp, 12-22 mm - Various Applications.



Fits:
Porsche 928 - 1978 to 1986
Porsche 924 - 1976 to 1986
Porsche 924S - 1986 to 1988
Porsche 944 - 1982 to 1991
Porsche 968 - 1992 to 1995



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

99951255400

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Hose for air ducting between idle speed adjuster and throttle body
OE Match intake distributor throttle to idle control valve hose for Porsche 928 S4, GT, and GTS models from 1987 to 1995. This replacement air ducting hose fits between the idle speed adjuster and throttle body, helping restore correct idle air control, intake sealing, and smooth engine running.

Fits:
Porsche 928 S4 1987 - 1991
Porsche 928 GT 1989 - 1991
Porsche 928 GTS 1992 - 1995

Diagram ref no 15

The hose routes controlled bypass air between the idle speed adjuster and throttle body as part of the idle air control system. A correctly sealed hose helps the engine control idle speed accurately, prevents unmetered air entry, and supports smooth running at idle and low throttle openings.

Functions
•  Replaces the intake distributor throttle to idle control valve hose
•  Fits between idle speed adjuster and throttle body
•  Routes idle control air correctly
•  Helps maintain stable idle speed
•  Helps prevent vacuum leaks and unmetered air entry
•  Supports smooth throttle response and reliable engine running
•  Suitable for intake service, idle control repair, or engine bay restoration
•  OE Match replacement for Porsche 928 S4, GT, and GTS intake system maintenance.

Why Replace This Part?
Idle control and intake air hoses can harden, crack, split, collapse, or become oil-soaked due to age, heat, engine bay conditions, and repeated temperature cycles. A damaged hose may cause rough idle, high or unstable idle speed, hesitation, vacuum leaks, intake air leaks, poor throttle response, or incorrect idle control valve operation. Replacing the hose helps restore proper intake sealing and idle control system function.

When to Replace This Part
•   Idle is rough, high, hunting, or unstable
•   Hose is cracked, brittle, split, collapsed, or leaking
•   Vacuum leak symptoms are present
•   Poor low-speed throttle response is noticed
•   Idle speed adjuster or throttle body service is being carried out
•   Intake air system maintenance is in progress
•   Vehicle is undergoing Porsche 928 engine bay restoration or refresh.

Where it fits on the car
This hose fits within the engine intake and idle air control system, running between the idle speed adjuster and throttle body on Porsche 928 S4, GT, and GTS models.

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

92811063300

The product you are viewing cross references to these numbers

Pipe Assembly. 

Fits:
Porsche 928 S4 5.0L 1987>>1992
Cars With Engine Codes:
2841 / 2842

Porsche 928 GT 5.0L 1989>>1991
Cars With Engine Codes:
2847

Porsche 928 GTS 5.4L 1992>>1995
Cars With Engine Codes:
2849 / 2850

Diagram Ref No 9

Related reference numbers
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92811001401

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Stainless steel clamp kit for Turbo inlet hose kit



To Fit:
For Turbo inlet hose kit #DO88-KIT145S
Porsche 911 (930 Turbo) 1978-1989 with 3.3 Litre Turbo engine

Kit of 6 clamps

The kit contains all necessary hose clamps to install the specified hose kit. The included clamps are a high quality standard design type in all stainless steel (W4 class) with a stamped band to minimize impact on hose surface.

Related reference numbers
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CLAMP-KIT145

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Silicone turbo vacuum hose kit.
Made from high quality silicone rubber with 3 layer polyester reinforcement.



To Fit:
Porsche 911 (930 Turbo) 1978-1989 with 3.3 Litre Turbo engine


Hoses included:
• Wastegate hose, OEM ref 99923903440
• Warm-up valve / Air filter box, OEM ref 99923900640 / 99923903440
• Warm-up valve / T-connection on throttle body, OEM ref 99923901340
• T-connection on throttle body / Vacuum limiter, OEM ref 99923901340

Please refer to the product images for confirmation of position of the hose.

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

DO88-KIT144S

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Turbo vacuum hoses clamp kit.



To Fit:
For Turbo vacuum hose kit #DO88-KIT144S
Porsche 911 (930 Turbo) 1978-1989 with 3.3 Litre Turbo engine

Kit of 8 clamps

The kit contains all necessary hose clamps to install the specified hose kit. The included clamps are a high quality standard design type in all stainless steel (W4 class) with a stamped band to minimize impact on hose surface.

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

CLAMP-KIT144

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Vacuum hose / Brake booster line
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.

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92811022001

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Vacuum hose / Brake booster line
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

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