Flexible brake cup hose. This part number supersedes to 99918102150 Genuine Porsche part 90135592703

Code: 90135592703

Genuine Porsche part

Flexible brake cup hose. This part number supersedes to 99918102150

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.

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Brake Fluid Reservoir Lid Seal. Porsche 911 / 914 / 928

90135590800/1

Product Information

Brake Fluid Reservoir Cap Seal

High-quality replacement brake fluid reservoir cap seal designed for classic Porsche 911 (1968–1986), Porsche 914, and Porsche 928 models.

This gasket fits inside the brake fluid reservoir cap, providing a secure seal to prevent fluid leakage and protect the braking system from moisture and contamination.

Fits:

Porsche 911 1965-1968 2.0L / 912 SWB (F)
Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1984-1986 3.2L
Porsche 911 1987-1989 3.2L G50
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1989 3.3L 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
Porsche 914 (1970-1976)
Porsche 912E 4CYL 1976

Diagram ref no 3

Manufactured to OEM specifications, this seal ensures reliable performance and is an essential component for maintaining proper brake system function, especially on classic and air-cooled Porsche models.

Key Features

• Direct replacement brake fluid reservoir cap seal
• Fits inside reservoir cap for secure sealing
• OEM-style fit and performance
• Helps prevent brake fluid leaks and contamination
• Durable material for long-term reliability
• Ideal for maintenance and restoration

Function and Purpose

This cap seal ensures a tight closure of the brake fluid reservoir.

It helps to:

• Prevent brake fluid leakage
• Protect system from moisture ingress
• Maintain correct hydraulic pressure
• Preserve braking system performance

Why Replace Your Brake Fluid Cap Seal

Over time, seals can degrade due to exposure to brake fluid and environmental conditions.

Common issues include:

• Cracked or hardened rubber
• Fluid seepage around the cap
• Moisture entering the system
• Reduced braking performance

Replacing the seal helps maintain safe and reliable braking.

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Related, superseded, cross reference or alternative numbers for comparison.

90135590800

90135590800

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Flexible brake cup hose. This part number supersedes to 99918102150 Genuine Porsche part 90135592703