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Porsche // 944 (1982-1991) // 944 Turbo 2.5L 8V 1989-91
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- Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD 2017-20
- Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD Executive 2017-20
- Porsche 971.1 Panamera 4 E-Hybrid 2.9L Twin-Turbo V6 Sport Turismo 2017-20
- Porsche 971.2 Panamera 4 E-Hybrid 2.9L V6 2021-23
- Porsche 971.2 Panamera 4 E-Hybrid Sport Turismo 2.9L V6 2021-23
- Porsche 971.2 Panamera 4S E-Hybrid 2.9L V6 2021-23
- Porsche 971.2 Panamera 4S E-Hybrid Sport Turismo 2.9L V6 2021-23
The Tandem Brake Master Cylinder is a BOSCH Porsche 971.1 / 971.2 Panamera hydraulic braking system component responsible for converting brake pedal input into hydraulic pressure for the vehicle's dual-circuit braking system. Designed to operate both primary and secondary brake circuits independently, the tandem master cylinder is a critical safety component that ensures consistent braking performance and redundancy in the event of a circuit fault.
Fits:
- Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD 2018-20
- Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD Executive 2018-20
- Porsche 971.1 Panamera 4 E-Hybrid 2.9L Twin-Turbo V6 Sport Turismo 2018-20
- Porsche 971.2 Panamera 4 E-Hybrid 2.9L V6 2021-23
- Porsche 971.2 Panamera 4 E-Hybrid Sport Turismo 2.9L V6 2021-23
- Porsche 971.2 Panamera 4S E-Hybrid 2.9L V6 2021-23
- Porsche 971.2 Panamera 4S E-Hybrid Sport Turismo 2.9L V6 2021-23
Diagram Ref No 3
This BOSCH master cylinder delivers precise brake modulation, consistent pedal feel, and reliable hydraulic pressure distribution. It is engineered to integrate seamlessly with modern Porsche braking technologies, including ABS, Porsche Stability Management (PSM), and other driver assistance systems.
What This Product Does:
- Converts brake pedal force into hydraulic braking pressure
- Supplies pressure to separate front and rear brake circuits
- Provides consistent and responsive braking performance
- Supports ABS, PSM, and electronic braking systems
- Maintains balanced brake force distribution across the vehicle
- Ensures safe and reliable stopping power under all driving conditions
Symptoms Of Wear Or Failure:
- Soft, spongy, or inconsistent brake pedal feel
- Brake pedal slowly sinking when pressure is applied
- Reduced braking effectiveness or longer stopping distances
- Brake fluid leaks around the master cylinder
- Brake warning lights illuminated on the dashboard
- Uneven brake pressure between circuits
- Difficulty maintaining brake pressure during repeated braking
- Internal seal wear causing hydraulic pressure loss
Why Replacement Matters:
- Restores correct hydraulic brake pressure and performance
- Improves brake pedal feel and driver confidence
- Maintains safe operation of the dual-circuit braking system
- Supports proper functionality of ABS and stability systems
- Prevents brake fluid leaks and hydraulic pressure loss
- Reduces the risk of brake system failure
- Ensures predictable and consistent stopping performance
- Protects the integrity of the entire braking system and related components
Related reference numbers
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971614019K
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)
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- 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 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- 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
Fits:
Porsche 911 / 911S / Carrera 3.0 1977>>
Porsche 930 Turbo 1977>>
Porsche 924 1976-85
Porsche 924S 1986-88
Porsche 928 1978-95
Porsche 944 1982-90
Porsche 968 1992-95
Click 'zoom in' for large parts diagram.
Diagram ref no 22.
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95535592100
The product you are viewing cross references to these numbers
Fits:
Porsche 911 1977-89
Porsche 911 (930) Turbo 1975-89
Porsche 924 1976-85
Porsche 924 S 1986-88
Porsche 928 1978-85
Porsche 944 1982-90
Porsche 968 1992-95
Click 'Zoom in' for large parts diagram.
Diagram ref no 23
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251611243
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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.
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L040
The product you are viewing cross references to these numbers
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.
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95002
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