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Porsche
Porsche brake master cylinder for the right-hand-drive 955 and 957 Cayenne applications listed below. The supplied assembly records identify this version by equipment code PR:L0R.
Fits
- 955 Cayenne 3.2L V6 2003–06
- 955 Cayenne S 4.5L V8 2003–06
- 955 Cayenne Turbo 4.5L 2003–06
- 955 Cayenne Turbo S 4.5L 2006>>
- 957 Cayenne 3.0L Diesel 2007–10
- 957 Cayenne 3.6L 2007–10
- 957 Cayenne S / GTS 4.8L 2007–10
- 957 Cayenne Turbo / Turbo S 4.8L 2007–10
Application restriction: rhd; PR:L0R. Check fitment for your specific vehicle (model, year, engine) before ordering.
Diagram: Brake master cylinder / Brake booster / Vacuum line / Vacuum pump Cayenne 9PA (955) 2003-06
Diagram: Brake master cylinder / Brake servo / Vacuum line Cayenne 9PA1 (957) 2007-10
What This Product Does
The master cylinder changes the mechanical input from the brake pedal into fluid pressure within the hydraulic braking circuit. It is a separate component from the brake booster or servo, which assists pedal operation.
Functions
- Generates hydraulic pressure from brake-pedal input.
- Supplies pressurised brake fluid to the braking system.
Technical Details
- Porsche part number: 95535501620.
- Drive configuration: Right Hand Drive (RHD), recorded as rhd.
- Equipment identification: PR:L0R.
- Diagram quantity: 1 master cylinder per vehicle.
- 955 diagram instruction: Use also:; Pressure sensor 955.355.305.00.
- The reservoir, pressure sensor and sealing components have separate entries in the supplied assembly records; these entries do not confirm package contents.
Symptoms of Fault
- A soft or spongy brake pedal.
- The pedal gradually sinking while pressure is maintained.
- Brake-fluid leakage around the cylinder's rear connection.
Why Replacement Matters
Deteriorated internal seals can allow fluid to escape or pressure to fall within the cylinder. Renewal addresses a confirmed cylinder fault, rather than unrelated wear elsewhere in the braking system. Similar pedal symptoms can have other causes, so diagnosis should precede replacement.
FAQs
Is this the right-hand-drive version?
Yes. Both supplied diagrams specify rhd and PR:L0R for part 95535501620.
Is a pressure sensor referenced?
The 955 assembly entry states: Use also:; Pressure sensor 955.355.305.00. This instruction does not establish that the sensor is included.
Are the reservoir and seals included?
The supplied information identifies them separately but does not specify the contents supplied with this cylinder.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95535501620
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne 3.2L V6 2003-06
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 957 Cayenne 3.6L 2007-10
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
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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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
L040
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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
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95002
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