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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
Related, superseded, cross reference or alternative numbers for comparison.
971614019K
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
Fits:
Porsche 996 C2 M338 (M338 - Rear wheel drive)
Porsche Boxster 986
*without PSM
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99635591000
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C4 3.6L 09/01-2005
Fits:
Porsche 996 C4 M339 (M339 - Four wheel drive)
Porsche Boxster 986
*with PSM
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99635591040
The product you are viewing cross references to these numbers
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
The product you are viewing cross references to these numbers