Endless Racing MONO4 Front Performance Brake System for GDB Subaru Impreza WRX STi
4POT caliper version of forged and molded Monobloc Calipers. Conducting many tests in pursuit of reduced weight, durability, radiation, etc., Endless reviewed the shape of the details time and again before achieving perfection. They also enabled installation of wheels from 15 inches as well as increasing installable wheels.
- Weight : 2100g
- Size : 141mm x 72.5mm x 270mm
- Compatible Rotor Diameter : φ300mm – φ355mm
- Std Color of Kit : Racing Anodize
- Std Compound for Kit : Type R / MX72 / MX72-Plus
- Compatible Wheel Size : 15″
For racing, rally or street, Endless only uses the highest quality materials and design to achieve the best performance possible. These calipers will cope in the toughest of conditions without flexing or losing accuracy. Combine the calipers with RF650 Racing Super Fluid for optimum performance. Your pads will be applied and released with great precision and reliability.
Forged Monobloc Caliper Body
Monobloc Calipers forged and molded through several thousand tons of pressure. 4 years after its conception and 1 year after the completed prototype it was entered into test races repeatedly and changed its specifications while also obtaining a body that is sufficiently light and hard to compete in races. The processing of the highly difficult piston cylinder was cleared using advanced special technology. The finished body was completed using an ultra-hard anodized aluminum. It is the final product of the technology created by Endless and its “never-ending challenge” as it continues to focus on quality forging.
“E-Slit” Double Shaving Effect
The long slit which draws gentle curves and the E slit which runs above the long slit are what make E-Slit Rotor impressive. The pad is constantly kept in optimal shape through the double shading effect demonstrated by the long slit, which gently carves the pad, and the E Slit, which gives strong brake force, providing further improvement of brake force. When the long slit on the rotor surface side disappears and the letter E floats up it is about time for replacement.
Also, even during the period of use, the brake rotor may be damaged due to aging deterioration such as rust and corrosion, so it is recommended to replace it at least once every two years.
- Material : Steel with Special Carbon
- 1-Piece Design
- Slit Shape : E-Slit
- Special Heat Treatment
- The E-Slit rotor consists of the narrow curved slit incorporated with 4 smaller E-Slits. The smoother shaving of the pad by the long curved slit and the increased friction provided by the E-Slits maintain optimal brake pad condition at all times. The rotor material consists of a special carbon blend, an Endless original technology, facilitating stable mu-levels, decreasing heat cracks and extracting 100% of the brake pads performance. Slits are designed for optimal shaving.
Cost Effective, and More On So Many Levels
- Endless Steel discs are more cost effective, and offer a wider range of performance options. Many drivers and racing teams prefer the feel and characteristics of Endless steel discs.
Special Heat Treatment Process
- With prolonged hard driving, the rotor surface will expand and contract due to heat, causing fine cracks (heat cracks), and you will not be able to obtain appropriate friction. To prevent this, special heat treatment was performed in advance to stabilize the components of the rotor itself and significantly reduce heat cracks during hard driving. As a result, the life of the rotor has been extended, and it has become possible to use it for a long time with peace of mind.
Blue Rotor Hat Finish
- The bell hat part is painted blue to aid in preventing corrosion resistance and also can be expected to have a dress-up effect.
Ultra-Hard Alumite Caliper Body
Ultra-hard alumite is used for the caliper body of our monoblock series. A tough ram coat is used for the rotor bell housing. This makes it possible to significantly delay the discoloration of alumite even when used under high temperature conditions when driving on a circuit.
Hard Anodized Finish
The finish is a hard anodizing, which is the preference under track conditions. When raw aluminum reacts with the oxygen in the air, a hard surface film develops on aluminum which prevents further degradation. The process is called oxidation, and you can think of it like rust. The anodizing process leverages this natural phenomenon, and takes it a step further to produce an extremely hard protective layer of aluminum oxide. The result is a finish that is far more appropriate for racetrack use. Anodizing creates a uniform surface that is much more abrasion resistant than paint or powder coat.
Circuit-dedicated pads that emphasize high-temperature characteristics, in order to bring out the original performance, it is indispensable to perform the work called “bedding” in which heat is applied in advance before hard driving to make a hit.
Bedding is always done in the top categories SUPER GT, WRC and various races in Europe.
Before using semi-metal brake pads, proper bedding is required to stabilize high temperature performance and extend the life of the pads and rotors.
How to Bed
- When driving on a circuit when a new product is installed, raise the rotor temperature to about 400 – 500° C while avoiding hard braking, and add atari. After that, if the temperature is lowered to 100° C or less by natural cooling, the process is completed.
- Endless Racing Calipers (2)
- Brake Pad Set
- Caliper Mounting Brackets (2)
- Large Diameter Brake Rotors (2) – 332mm x 30mm 3PC
- Stainless Brake Lines (2)
- It may not be possible to bring out the original performance of the brake pads when bedding in the rain. Bedding should be done in fine weather as much as possible.
- Compatible wheels vary depending on the wheel brand and size.
- This product uses an E-slit rotor.
- Please note that there is no custom color setting for the Racing Monobloc series.
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