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91135501202/1
Product Information
Product Information
Brake Master Cylinder BIG BORE, 23mm High Performance Version.

The OE MATCH Brake Master Cylinder BIG BORE is a hydraulic braking component designed to convert brake pedal force into hydraulic pressure for the vehicle’s braking system. Featuring a larger bore design, this master cylinder is engineered to provide increased fluid displacement, making it particularly suitable for vehicles fitted with upgraded brake calipers or performance braking systems that require greater hydraulic volume.

Fits:

  • Porsche 911 1965-1968 2.0L / 912 SWB (F)
  • Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
  • Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
  • Porsche 911 1978-1983 3.0L / SC
  • Porsche 911 1975-1977 3.0L Turbo (930)
  • Porsche 914 (1970-1976)  


This is a high performance upgrade to the stock Porsche 911 Master Cylinder for non-power brake applications. The increased 23mm bore (vs. 19mm) should be used on cars that are fitted with 'larger than stock' brakes to increase pedal pressure and feel. Unlike other kits on the market, which require modifications to the lines and the push rod, our Master Cylinder is a direct fit.

The master cylinder is designed to deliver precise brake pedal feel, consistent hydraulic pressure, and reliable braking performance. As the central component of the hydraulic braking system, it plays a critical role in ensuring safe, responsive, and predictable stopping power.

What This Product Does:

  • Converts brake pedal input into hydraulic pressure
  • Supplies brake fluid pressure to the braking system
  • Provides increased fluid displacement through its larger bore design
  • Supports performance and upgraded brake system applications
  • Maintains consistent brake pedal feel and braking response
  • Works with dual-circuit braking systems for enhanced safety

Symptoms Of Wear Or Failure:
  • Soft or spongy brake pedal feel
  • Brake pedal slowly sinking under pressure
  • Reduced braking effectiveness
  • Brake fluid leaks around the master cylinder
  • Inconsistent brake pressure or pedal response
  • Difficulty building hydraulic pressure
  • Brake warning lights illuminating
  • Internal seal wear causing pressure loss between circuits

Why Replacement Matters:
  • Restores correct hydraulic pressure throughout the braking system
  • Improves brake pedal feel and responsiveness
  • Ensures consistent and predictable braking performance
  • Prevents brake fluid leaks and pressure loss
  • Supports safe operation of dual-circuit braking systems
  • Maintains compatibility with performance brake upgrades
  • Reduces the risk of braking system failure
  • Helps preserve driver confidence and vehicle safety under all driving conditions



Related reference numbers
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91135501202
91135501202A

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