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Porsche // Boxster 986/987/981 (1997-2016) // Any
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- Porsche 9YA Cayenne E-Hybrid V6 3.0L V6 (340Hp) 2018-23
- Porsche 9YA Cayenne Coupe E-Hybrid V6 3.0L (340Hp) 2020-23
The Tandem Brake Master Cylinder is a genuine OEM Porsche hydraulic braking system component designed to generate and distribute brake fluid pressure to the vehicle's dual-circuit braking system. As the primary hydraulic control unit, the tandem master cylinder converts brake pedal input into hydraulic pressure, supplying separate front and rear brake circuits for enhanced safety and braking reliability.
Fits:
- Porsche 9YA Cayenne E-Hybrid V6 3.0L V6 (340Hp) 2018-23
- Porsche 9YA Cayenne Coupe E-Hybrid V6 3.0L (340Hp) 2020-23
Diagram Ref No 2
Manufactured to Porsche’s exact specifications, this master cylinder is engineered for precise brake pedal feel, consistent hydraulic performance, and seamless integration with ABS, PSM, and other electronic braking systems. Constructed from high-quality corrosion-resistant materials and precision-machined internal components, it is designed to deliver long-term durability and dependable braking performance.
What This Product Does:
- Converts brake pedal force into hydraulic pressure
- Supplies brake fluid pressure to dual braking circuits
- Provides safe and reliable braking performance
- Supports ABS, stability control, and driver assistance systems
- Maintains consistent brake pedal feel and response
- Ensures balanced braking force distribution throughout the vehicle
Symptoms Of Wear Or Failure:
- Soft or spongy brake pedal feel
- Brake pedal slowly sinking to the floor
- Reduced braking performance
- Brake fluid leaks around the master cylinder
- Inconsistent brake pressure or braking response
- Brake warning lights appearing on the dashboard
- Difficulty maintaining braking force under repeated use
- Internal seal failure causing pressure loss between circuits
Why Replacement Matters:
- Restores correct hydraulic brake pressure
- Improves brake pedal feel and responsiveness
- Maintains safe operation of the dual-circuit braking system
- Supports proper ABS and stability control functionality
- Prevents brake fluid leakage and pressure loss
- Reduces the risk of braking system failure
- Ensures reliable and predictable stopping performance under all driving conditions
- Helps maintain the safety standards expected of Porsche braking systems
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9Y0614019
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
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
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
251611243
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