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Porsche > 356 (1950-1965) > 356B 1959-63 > Brakes >

Brake Fluid Reservoir

Brake Fluid Reservoir

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DISPLAYING 1 to 8 (of 8 products)
Brake fluid reservoir tank and filter kit. Porsche 356 - 477611361, 35642412, 356 42412 - 356-42-091, 356-42-412
2
Brake fluid reservoir tank and filter kit. Porsche 356
35642091KIT
Product Information
Product Information
Brake fluid reservoir tank and filter kit.

Fits:
Porsche 356 - 1950 to 1955
Porsche 356A - 1955 to 1959
Porsche 356B - 1959 to 1963

This is a Concourse quality brake fluid reservoir and gland nut strainer screen kit, for your ATE Metal master cylinder reservoir tanks. These screens are a good idea to replace after few years, since the brake fluid will over time clog the screen. These can easily unscrew off and be replaced when bleeding your brake fluid. 

Diagram ref no 16 and 17

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Related, superseded, cross reference or alternative numbers for comparison.

35642091KIT
477611361
35642412
356 42412

The product you are viewing cross references to these numbers
Brake fluid DOT 4 20ltr Textar
1
Brake fluid DOT 4 20ltr Textar
95002500
Product Information
Product Information
Brake fluid DOT 4 20Ltr Textar


textar

Brake fluid is one of the most important fluids in a car as without it, stopping the vehicle safely would be impossible. The Brake fluid transmits the force exerted by the driver on the brake pedal onto the wheel brake. 
To ensure perfect operation of the brakes, the brake fluid must be changed regularly during inspection or maintenance and tested with the correct brake fluid tester.

Brake fluid should be changed every two years. 

The higher the DOT class, the higher the boiling temperature and wet boiling point. Higher DOT classes tend to allow longer maintenance intervals. The DOT standards are based on the American FMVSS-116 standard of the Department of Transportation (DOT).

Boiling Point and Viscosity

Dry Boiling Point - describes the property of the sealed new brake fluid. In this state, the brake fluid is almost anhydrous (substance containing no water). The dry boiling point is usually between 240 and 280°C.

Wet Boiling Point - determines the property of the brake fluid at the end of its life cycle, at a water content of 3.5% the fluid should be replaced. This defined wet boiling point must not be undercut.

Viscosity - describes the flow rate of the brake fluid. The lower the viscosity, the faster the brake fluid flows through the brake system, and the faster the brake signals are transmitted. 

Important Notes
• Brake fluid is poisonous and a hazardous waste.
• Be careful when changing. The fluid weakens paints and plastics.
• It must not come into contact with eyes or skin. Always rinse spilled liquid with water.
• Do not pour the liquid into drinking water or mix with used oil.
• The colour of the brake fluid reveals nothing about its quality.
• Brake fluid should be stored in its original packaging and in a dry, cool and well-ventilated place.



Find out about Textar product verification here
Brake Fluid DOT 4 Brembo Premium Brake Fluid - 00004320209, 00004320366, 00004321082, 00004330552 - L04005, L04010, L04050
7
Brake Fluid DOT 4 Brembo Premium Brake Fluid
L040
Product Information
Product Information
Brake discs, calipers, pads and brake master cylinders are the four cardinal points of each brake system; however, they are likely to be useless without the core of the entire system, the brake fluid. This component is so neglected as to be generally controlled in a summary fashion, with topping instead of a more appropriate replacement, at the change frequency recommended by the manufacturer.
brembo


DOT 4
Having an extremely high boiling point and lower viscosity than required, it meets and greatly exceeds regulatory standards. Also suitable for vehicles with ABS.

Vapour Lock formation
This sort of habit leaves room for the Vapour Lock, the formation of vapour bubbles due to boiling of the brake fluid that replace the normal fluid and are compressed, thereby sending the brake pedal to its fill stoke (spongy pedal). The origin is incident in the porosity of the tubes that make up the braking circuit, which in time draw moisture into the fluid, drastically reducing the boiling point. The result is a reduced braking efficiency.

Brembo Premium Brake Fluid
Brembo Premium brake fluids have a higher boiling point that exceeds the standard, thus offering superior resistance to the Vapour Lock and ensuring braking efficiency even at low temperatures. With high anti-corrosion properties and resistance to oxidation, Brembo brake fluid also allows for long-term unaltered chemical/physical characteristics of the fluid in operating circuit; therefore, preserving its integrity.



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

L040
00004320209
00004320366
00004321082
00004330552

The product you are viewing cross references to these numbers
Brake fluid DOT 4 LV (Low Viscosity) Textar. - 00004330552, 00004320366, 00004321082, 00004320209
5
Brake fluid DOT 4 LV (Low Viscosity) Textar.
95006
Product Information
Product Information

Brake fluid DOT 4 LV (Low Viscosity) Textar.

textar

Textar DOT 4 LV (Low Viscosity) is especially recommended for use in hydraulic brake and clutch systems of vehicles fitted with ESP, ABS and ASR with a high boiling point and outstanding performance at very low temperatures.

DOT 4 LV (Low Viscosity)
Dry Boiling Point ≥ 260° C 
Wet Boiling Point ≥ 165° C 
Viscosity at -40C < 750 mm2 /s

Brake fluid is one of the most important fluids in a car as without it, stopping the vehicle safely would be impossible. The Brake fluid transmits the force exerted by the driver on the brake pedal onto the wheel brake. 
To ensure perfect operation of the brakes, the brake fluid must be changed regularly during inspection or maintenance and tested with the correct brake fluid tester.

Brake fluid should be changed every two years. 

The higher the DOT class, the higher the boiling temperature and wet boiling point. Higher DOT classes tend to allow longer maintenance intervals. The DOT standards are based on the American FMVSS-116 standard of the Department of Transportation (DOT).

Boiling Point and Viscosity

Dry Boiling Point - describes the property of the sealed new brake fluid. In this state, the brake fluid is almost anhydrous (substance containing no water). The dry boiling point is usually between 240 and 280°C.

Wet Boiling Point - determines the property of the brake fluid at the end of its life cycle, at a water content of 3.5% the fluid should be replaced. This defined wet boiling point must not be undercut. <

Viscosity - describes the flow rate of the brake fluid. The lower the viscosity, the faster the brake fluid flows through the brake system, and the faster the brake signals are transmitted. 

Important Notes

• Brake fluid is poisonous and a hazardous waste.
• Be careful when changing. The fluid weakens paints and plastics.
• It must not come into contact with eyes or skin. Always rinse spilled liquid with water.
• Do not pour the liquid into drinking water or mix with used oil.
• The colour of the brake fluid reveals nothing about its quality.
• Brake fluid should be stored in its original packaging and in a dry, cool and well-ventilated place.



Find out about Textar product verification here

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

95006
00004330552
00004320366
00004321082
00004320209

The product you are viewing cross references to these numbers
Brake fluid dot 4 Textar - 00004430501, 00004321082, 00004330552, 00004320366, 00004320209
6
Brake fluid dot 4 Textar
95002
Product Information
Product Information
Brake fluid DOT 4 

textar

Brake fluid is one of the most important fluids in a car as without it, stopping the vehicle safely would be impossible. The Brake fluid transmits the force exerted by the driver on the brake pedal onto the wheel brake. 

To ensure perfect operation of the brakes, the brake fluid must be changed regularly during inspection or maintenance and tested with the correct brake fluid tester.

Brake fluid should be changed every two years. 

The higher the DOT class, the higher the boiling temperature and wet boiling point. Higher DOT classes tend to allow longer maintenance intervals. The DOT standards are based on the American FMVSS-116 standard of the Department of Transportation (DOT).

Boiling Point and Viscosity

Dry Boiling Point - describes the property of the sealed new brake fluid. In this state, the brake fluid is almost anhydrous (substance containing no water). The dry boiling point is usually between 240 and 280°C.

Wet Boiling Point - determines the property of the brake fluid at the end of its life cycle, at a water content of 3.5% the fluid should be replaced. This defined wet boiling point must not be undercut. 

Viscosity - describes the flow rate of the brake fluid. The lower the viscosity, the faster the brake fluid flows through the brake system, and the faster the brake signals are transmitted. 

Important Notes
• Brake fluid is poisonous and a hazardous waste.
• Be careful when changing. The fluid weakens paints and plastics.
• It must not come into contact with eyes or skin. Always rinse spilled liquid with water.
• Do not pour the liquid into drinking water or mix with used oil.
• The colour of the brake fluid reveals nothing about its quality.
• Brake fluid should be stored in its original packaging and in a dry, cool and well-ventilated place.

Find out about Textar product verification here

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

95002
00004430501
00004321082
00004330552
00004320366
00004320209

The product you are viewing cross references to these numbers
Brake fluid reservoir. Porsche 356 /A/B - 35642091 - 1661200100
3
Brake fluid reservoir. Porsche 356 /A/B
35642091/1
Product Information
Product Information
Brake Fluid Tank, Aluminium OE Look, Without Cap.
Restore a key part of the braking hydraulic system while maintaining a period-correct appearance with this OE Match Aluminium Brake Fluid Tank. Manufactured in aluminium with an OE-style appearance, this reservoir is designed for compatible classic vehicle applications where originality, durability, and reliable brake fluid storage are important.

Fits:
Porsche 356 - 1950 to 1955
Porsche 356A - 1955 to 1959
Porsche 356B - 1959 to 1963

Diagram Ref No 16

The brake fluid tank stores the hydraulic fluid required by the braking system. As the brakes are applied, brake fluid transmits hydraulic pressure through the system, allowing the braking components at the wheels to operate. The reservoir provides a supply of fluid to the hydraulic circuit and allows the fluid level to be monitored and maintained.  

What This Product Does:
  • Stores the brake fluid required by the hydraulic braking system.
  • Maintains a reserve supply of fluid for the brake hydraulic circuit.
  • Helps ensure the braking system remains adequately supplied with fluid.
  • Allows the brake fluid level to be monitored and maintained.
  • Provides connection points for the associated hydraulic supply components.
  • Features aluminium construction for durability.
  • Provides an OE-style appearance suitable for classic vehicle restoration.
  • Replaces a corroded, leaking, damaged, or unsuitable brake fluid reservoir.
  • Helps maintain a clean and correctly presented braking system installation.
  • Is supplied without a reservoir cap.

Symptoms Of Wear Or Failure:
  • Brake fluid leaking from the reservoir.
  • Fluid wetness around the tank, seams, or connections.
  • A brake fluid level that repeatedly drops.
  • Visible corrosion or deterioration of the original reservoir.
  • Cracks, dents, deformation, or other physical damage.
  • Damaged or deteriorated hose connections.
  • Contamination visible inside the reservoir.
  • Difficulty maintaining a dependable seal around associated fittings.
  • A reservoir damaged during servicing or restoration.
  • An original tank that has deteriorated beyond reliable continued use.

Why Replacement Matters:

  • The brake fluid reservoir is an important part of the vehicle's hydraulic braking system. It must securely contain the fluid needed for reliable brake operation and prevent contamination from entering the hydraulic circuit.
  • A leaking reservoir can gradually reduce the brake fluid level. If the fluid level becomes sufficiently low, air may enter the hydraulic system. Air in the brake lines can result in a soft or spongy pedal and reduced braking effectiveness.
  • Brake fluid leakage should therefore never be ignored. Any unexplained loss of brake fluid requires immediate investigation because it can indicate a fault capable of compromising braking performance.
  • Corrosion or internal contamination is another reason to replace an ageing reservoir. Dirt, corrosion products, moisture, or other contaminants entering the hydraulic system can contribute to deterioration of master cylinders, wheel cylinders, calipers, and other braking components.



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

35642091
35642091

The product you are viewing cross references to these numbers
Gland nut Union and strainer for brake fluid tank. Porsche 356 - 477611361, 35642412 - 1661200200
3
Gland nut Union and strainer for brake fluid tank. Porsche 356
35642412/1
Product Information
Product Information
Union And Strainer For Brake Fluid Tank.
Restore a clean and dependable connection within the braking hydraulic system with this OE Match Union and Strainer for Brake Fluid Tank. Designed for compatible classic vehicle applications, this component combines the connection between the brake fluid reservoir and associated fluid supply system with a strainer that helps prevent larger contaminants from entering the hydraulic circuit.

Fits:
Porsche 356 - 1950 to 1955
Porsche 356A - 1955 to 1959
Porsche 356B - 1959 to 1963

This is a Concourse quality gland nut strainer screen, for your ATE Metal master cylinder reservoir tanks. These screens are a good idea to replace after few years, since the brake fluid will over time clog the screen. These can easily unscrew off and be replaced when bleeding your brake fluid. 

Diagram Ref No 17

The brake fluid reservoir stores the hydraulic fluid required for brake operation. From the reservoir, fluid must travel through secure connections to the master cylinder and the rest of the braking system. The union provides an important connection point, while the integrated strainer helps keep unwanted particles and debris from passing further into the system.  

What This Product Does:
  • Provides a connection at the brake fluid reservoir.
  • Helps transfer brake fluid from the reservoir into the hydraulic supply system.
  • Incorporates a strainer to help capture larger particles and debris.
  • Helps protect downstream hydraulic components from contamination.
  • Supports a clean and reliable brake fluid supply.
  • Helps maintain a secure connection at the brake fluid tank.
  • Supports correct operation of the master cylinder and hydraulic braking system.
  • Replaces a damaged, contaminated, corroded, blocked, or missing component.
  • Provides an OE-style replacement for compatible classic vehicle applications.
  • Is suitable for brake system maintenance and restoration projects.

Symptoms Of Wear Or Failure:
  • Brake fluid leaking around the reservoir connection.
  • Wetness or fluid staining around the union.
  • A brake fluid level that repeatedly falls.
  • Visible corrosion or deterioration of the union.
  • Cracks, deformation, or physical damage.
  • A damaged or contaminated strainer.
  • Debris or deposits restricting the strainer.
  • Reduced or restricted brake fluid flow.
  • Difficulty obtaining a secure, leak-free connection.
  • Contamination discovered within the brake fluid reservoir.
  • Deterioration found during brake system restoration or servicing.
  • The original union or strainer is missing.

Why Replacement Matters:

  • The hydraulic braking system relies on a clean and uninterrupted supply of brake fluid. Contamination within the system can damage precision hydraulic components, interfere with seals, and contribute to premature deterioration of the master cylinder, wheel cylinders, or brake calipers.
  • The strainer provides an additional level of protection by helping prevent larger debris from travelling from the reservoir into the hydraulic system. If the strainer becomes damaged or is missing, contaminants may have a more direct path into sensitive braking components.
  • A blocked or heavily contaminated strainer can also restrict fluid movement. Any restriction within the brake fluid supply system should be investigated because reliable hydraulic operation is essential for consistent braking performance.
  • The union must also maintain a dependable fluid-tight connection. Leakage can gradually lower the reservoir level, and if sufficient fluid is lost, air may enter the hydraulic system. This can result in a soft or spongy brake pedal and reduced braking effectiveness.



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

35642412
477611361
35642412

The product you are viewing cross references to these numbers
Halo GT Advanced DOT 4 Racing Brake Fluid - 600ml - 00004320209, 00004320366, 00004321082, 00004330552 - L04005, L04010, L04050
1
Halo GT Advanced DOT 4 Racing Brake Fluid - 600ml
GTEUK198L2
Product Information
Product Information
Halo GT Advanced DOT 4 Racing Brake Fluid
600ml aluminium bottle

Halo GT is the latest formulation with a DOT 4 base suitable for the demands of motorsport (such as low compressibility and low viscosity). It has a dry boiling point of 336 degrees Celsius which is higher than the Brembo HT64. Whilst withstanding the demands of motorsport, Halo GT is suitable for track day use.

Brake Later. Release Faster. Accelerate earlier. Every Lap.

Halo GT is the ultimate DOT 4 racing brake fluid, fully compliant and optimized for the latest racing ABS systems. Engineered for ultra-fast response, thermal stability, and consistent pedal feel under the most demanding race conditions.

FEATURES

01 | Derived from P1 Proven under extreme conditions. Built on Halo P1 chemistry, developed for the highest demands of motorsport.

02 | Designed for GT racing The ultimate in DOT 4 racing brake fluid, fully compliant and optimized for use with the latest racing ABS systems.

03 | Ultra low viscosity Faster system response for immediate feedback and precise control.

04 | Fade Resistant Technology™ Performance that lasts. Maintains consistent pedal feel under repeated heat cycles with minimal fade as temperatures rise.

05 | Corner focused Control where it matters most. Optimised for braking zones, release precision, and clean transition back to throttle.


Performance benefits

Sharper response. Better control. Faster exits from start to finish.
•  Faster hydraulic response under load
•  Greater stability through repeated braking cycles
•  Quicker piston release for reduced drag
•  More precise brake modulation
•  Reduced thermal stress in extreme conditions
•  Earlier throttle application on corner exit

Speed of Response.
Speed on Track. Modern Braking Systems demand instant response. Halo GT’s ultra-low viscosity allows the brake system to respond faster, improving communication between driver and car.
Faster pressure build-up. Cleaner release. Greater control at the limit.
Brake later. Release faster. Accelerate earlier.

Most races are won in the corner.
Anyone can be fast on the straight. But cornering takes skill. Performance is defined under braking, through release, and on exit. Halo GT is engineered for these moments. Giving drivers the confidence to brake faster, carry speed through the corner, and accelerate earlier. And continue to do that consistently, lap after lap.

For GT drivers who understand Performance.
Not for Everyone. Built for those who demand more.
Also suitable for Semi-Pro, Club Racing and Trackday performance drivers.

Technical Specification.

•  336°C dry boiling point
•  Ultra-low viscosity of 1350 cSt

Designed to maintain consistent performance under heat and repeated load, with full data available for detailed evaluation.



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

GTEUK198L2
00004320209
00004320366
00004321082
00004330552

The product you are viewing cross references to these numbers
DISPLAYING 1 to 8 (of 8 products)
Also found on these pages
About Brake Fluid Reservoir

Porsche Brake Fluid Reservoir | Design911 Precision Replacement Parts for Reliable Hydraulic Performance & Safety

The brake fluid reservoir is a critical component in your Porsche’s braking system, storing hydraulic fluid and supplying consistent pressure to the master cylinder. It ensures your brake system remains sealed, properly pressurised, and protected from contamination. A damaged or degraded reservoir can lead to leaks, air ingress, and reduced braking performance — making timely inspection and replacement essential for safety and reliability.

At Design911, we offer a full range of brake fluid reservoirs designed for perfect fitment, durability, and compatibility across classic and modern models. Manufactured from high-strength, heat-resistant polymers, each unit provides a secure seal and optimal performance under demanding conditions. Ideal for servicing, restoration, or performance maintenance, these reservoirs keep your Porsche’s braking system functioning as precisely as it was engineered to.

What Does a Brake Fluid Reservoir Do?

The brake fluid reservoir maintains hydraulic pressure and ensures the braking system operates safely and effectively at all times.

Core Functions:
• Holds and supplies brake fluid to the master cylinder.
• Maintains proper hydraulic pressure in the braking system.
• Prevents air, moisture, and contaminants from entering the fluid.
• Allows for visual inspection of fluid level and condition.
• Supports reliable braking response under all conditions.

A properly functioning reservoir ensures your Porsche’s braking system performs with precision, consistency, and confidence.

Why Do Brake Fluid Reservoirs Fail or Degrade?

Over time, the brake fluid reservoir can deteriorate due to heat, age, and exposure to hydraulic fluid. When cracks, leaks, or contamination occur, the integrity of the braking system is compromised.

Common Causes of Failure Include:
• Plastic fatigue or cracking from heat and vibration.
• Leaking seals or connections at the master cylinder.
• Contamination from moisture or debris entering the reservoir.
• Discolouration or clouding that obscures fluid level visibility.
• Wear from prolonged exposure to hydraulic fluid or UV damage.

When the reservoir fails, it can lead to fluid loss, air in the braking system, and diminished pedal response — all of which affect driving safety and control.

Why Replace Your Porsche Brake Fluid Reservoir?

Replacing a worn or damaged reservoir restores proper hydraulic pressure and ensures your braking system operates safely and efficiently. Design911’s high-quality replacements are designed for exact fitment and resilience in both everyday and performance applications.

Key Benefits:
• Restores full braking system reliability and safety.
• Prevents leaks, air ingress, and fluid contamination.
• Constructed from durable, heat- and fluid-resistant materials.
• Compatible with standard and high-performance brake fluids.
• Direct-fit design for easy installation and maintenance.
• Suitable for classic and modern Porsche models.

Design911’s Porsche brake fluid reservoirs are built for long-lasting durability, ensuring precise hydraulic performance and peace of mind behind the wheel.

Highlights

• Premium Porsche brake fluid reservoirs for all models.
• High-strength materials for durability and heat resistance.
• Ensures consistent hydraulic pressure and performance.
• Protects brake fluid from contamination and moisture.
• Perfect for restoration, maintenance, or performance upgrades.
• Designed for easy installation and long-term reliability.

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