AP Racing's two piece rotors have slotted attachment holes and are attached to the alloy hat with bobbins. This allows the rotor to float and freely expand as it gets hot. The free to move rotor stays round and flat, giving the brake pads a nice and flat surface to work on. This makes for more efficient and consistent brakes under all conditions.
The bobbin allows the rotor to move in its radially oriented slot as it expands. The rotor floats with about 0.012″ of play and to keep it from rattling too much on a street-driven car, a spring steel anti-rattle clip keeps the rotor in light tension to the hat while still allowing for radial moment.
The lines' banjo fittings can rotate 360 degrees for perfect alignment and less strain on the hose. The fittings also have anti-whip plastic inserts to reduce the likelihood of fatigue failures. The lines also have an abrasion resistant sheath for longer life and less snagging and chafing of the lines on other parts of the car.
The Essex Parts AP Racing big brake kit is a whopping 11 lbs a corner lighter than stock, much of this in rotating weight. About two pounds of this saving is also due to the unique Radi-CAL brake caliper. This is a huge 22 lbs right off the front of the car where it matters the most as it is both rotating and unsprung weight.
The Essex Parts brake system for our Mustang is so unique and we were so impressed, we felt that we had to share some of the technical details of it in a stand alone article before we installed it.
Stay tuned, we are currently building a complete high revving NA Coyote motor for our Mustang, after which we will show you the installation of these brakes. Once the engine is in, it will be back to the track to dial the car in and compare it to what it did stock when we started this project.
The best is yet to come!