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Brake Fluid Reservoir
- 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)
This pipe fits into the top of the master cylinder and allows a rubber hose to connect from the reservoir down to the master cylinder.
Fits:
Porsche 911 / 912 1965 - 1967
Porsche 911 1968 - 1977 *RHD cars only
Porsche 930 Turbo 1975 - 1977 *RHD cars only
Fits to number 11 on diagram.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90135564400
The product you are viewing cross references to these numbers
- 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 1975-1977 3.0L Turbo (930)

Fits:
Porsche 911 - 1974 to 1989
Click 'Zoom in' for large parts diagram.
Diagram ref no 4a
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91135542001
The product you are viewing cross references to these numbers
- 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)
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
The product you are viewing cross references to these numbers
Fits:
Porsche 911 - 1965 to 1989
Proper ATE markings on reservoirs, caps and underneath the cap
Comes with correct inner strainers.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91735501200
The product you are viewing cross references to these numbers
- 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)
-
brake fluid reservoir, brake master cylinder 911 1978-83 604-00
-
Brake fluid reservoir, brake master cylinder 911 1970-73 604-00
-
brake fluid reservoir and brake master cylinder 911 1984-86 604-00
-
Brake master cylinder for cars without brake booster 911 1974-77 604-00
-
brake fluid reservoir and brake master cylinder 911 1969 604-10
-
brake master cylinder for cars without brake booster 911 TURBO 1975-77 604-00
-
brake fluid reservoir and brake master cylinder 911 1968 604-05
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.