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Porsche // 996 (911) (1997-2005) // 996 GT3 MKI 1999-02
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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 BOSCH Porsche 9YA Cayenne 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
This BOSCH 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 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
Fits:
Porsche 996 C4S 3.6L 2002-05
Porsche 996 Turbo 2001-05
Porsche 996 GT3 1999-05
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99635591050
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
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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Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95002
The product you are viewing cross references to these numbers