The problem of brake fluid boiling is simply traced to heat transferring from the rotors and pads directly into the fluid through the caliper pistons. When brake fluid boils, it releases air that is normally part of the molecular structure of the fluid. This air is compressible of course, and the brake pedal goes to the floor instead of moving the caliper pistons. Production cars tend to suffer from this on track days more as they don't usually have the extensive cooling duct and exotic brake materials as true racing cars. True racing only brake calipers generally come with titanium caliper pistons for one reason. Titanium as a material, has low thermal conductivity. This means that it is very bad at transferring heat. Which is good if you are trying to keep your fluid cool.

The Girodisc solution to help prevent fluid boiling is to use a thin titanium shim placed between the pad back and the pistons, to keep the braking heat from transferring into the pistons and fluid. Here is a comparison of materials and their relative thermal conductivity ratings:

Titanium 6AL-4V 6.7 W/mk Steel 52 W/mk Aluminum 130 W/mk

You can see that Titanium will transfer far less heat than steel and especially aluminum. For cars that are going to see hard or multiple track days, these shims are cheap protection from loosing the pedal due to boiling at the wrong time and making the day very expensive.

Water jet cut to exact size, no cutting, grinding, or swearing involved.

Price is per axle (four pieces)

Girodisc is a Braking Technology Company dedicated to developing the best quality high performance braking components and solutions. 

Girodisc is guided under the direction of company Principal Martin Meade, who spent five years as an Engineer with Porsche Engineering Services, where he played a role in developing current Porsche technology. Martin began his engineering career working in Aerospace, developing tools and components for special projects. Before working with Porsche, Martin learned a great deal about vehicle design and technologies by working with several vehicle design and development firms. Martin has developed a critical eye and will not accept anything but the best quality.

Martin has enlisted help from key sources such as a former Road Testing engineer and Design Engineer for Brembo North America in the High Performance division, Eric Dahl. With lessons learned at Brembo, and experience in prototype and racing car design, Eric has developed a broad spectrum of engineering capabilities in the world of high performance automobiles, and specifically the technologies for developing braking systems.