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Writer's pictureGrant Lockhead

Why use Upgrade Motorsport spherical bearing master cylinder .7 bore in your race car?

Why use Upgrade Motorsport spherical bearing master cylinder .7 bore in your race car?

A motorsport spherical bearing master cylinder with a 0.7-inch bore is a hydraulic component often used in motorsports for brake or clutch systems. Here's an overview of what it is and why it’s used:

Aluminium billetv spherical bearing master cylinder
Upgrade Motorsport Spherical Bearing Master Cylinder - .7 Bore

What it is:

  • Master Cylinder: A master cylinder is responsible for converting mechanical force (like pressing the brake pedal) into hydraulic pressure to activate the braking or clutch system. It pushes brake fluid through the system, allowing the brakes to function or the clutch to disengage.

  • Spherical Bearing: A Motorsport spherical bearing master cylinder is a type of bearing that allows for some angular misalignment, as it can pivot or rotate in multiple directions. When integrated into a master cylinder, it helps accommodate any misalignment between the pedal and the cylinder, improving efficiency and reducing wear.

  • 0.7 Bore Size: The bore size refers to the diameter of the internal cylinder where the hydraulic fluid is compressed. In this case, it's 0.7 inches. This bore size determines how much fluid is displaced with each stroke and thus influences the hydraulic pressure in the brake or clutch system.

Pedal Assembly using spherical bearing master cylinders
Upgrade Motorsport Designed Pedal Assembly using Spherical Bearing Master Cylinders

Why use it:

  • Enhanced Alignment and Longevity: The spherical bearing allows for small angular misalignments between the pedal and the master cylinder, leading to smoother operation. This is particularly important in motorsport applications where high levels of precision and movement are involved. It also reduces wear and tear on the master cylinder.

2 Pedal assembly using spherical bearing master cylinders
Upgrade Motorsport Designed 2 Pedal Assembly using Spherical Bearing Master Cylinders
  • Improved Pedal Feel and Control: The 0.7 bore size strikes a balance between fluid displacement and pressure. A smaller bore, like 0.7 inches, generates higher hydraulic pressure for a given pedal force, which can result in better brake or clutch modulation, making it easier for the driver to control the vehicle, particularly in high-performance or racing environments.

  • Motorsport Performance: In motorsports, precise control of braking and clutch systems is crucial. The spherical bearing reduces the risk of failure due to misalignment, and the 0.7 bore size ensures the right amount of hydraulic pressure, offering a more responsive and controllable feel.


In summary, the combination of a spherical bearing for alignment and a 0.7-inch bore for optimal pressure makes this type of master cylinder popular in motorsports, where performance, reliability, and control are critical.

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