Replacement 350x34mm brake discs and hardware for APR Brake Systems.
The discs used in our big brake kits are cast from a proprietary high-carbon cast iron alloy that provides excellent durability and stability under the high thermal loads experienced during spirited driving or track day driving. The discs in our 2-piece kits feature our curved, directional, cooling vane design that increases cooling vane surface area for optimal cooling. The design also features robust disc plate walls to increase the thermal storage capacity of the discs. This is especially important during spirited driving and track day cars that are generating high brake temperatures but that are not fitted with brake cooling ducts that duct cool air from high pressure zones on the front of the car (as is often the case with true race cars). The truth is that very few fast road and track day enthusiasts will ever run brake cooling ducts as they typically require modification to the car's front end. In this case the robust disc plate walls employed in our 2-piece disc design are a real advantage in terms of thermal storage capacity, durability and service life of the disc. Lastly, we do not sacrifice cooling capacity for weight like many systems on the market using thinner discs and/or far fewer cooling vanes. The benefits from the weight loss are vastly countered by increased braking capacity.
The disc surface pattern provides an excellent balance between functional aspects such as efficient removal of friction gasses, carbonized pad material, water when driving in the rain, and practical aspects such as a good balance between strong initial bite and low NVH (noise, vibration, harshness). The slot pattern also provides good bite and release characterizes perfectly suited to the crossover street and entry-level track roll intended for our brake kits. Every single disc assembly is measured for run-out and disk thickness variations (DTV) using Swiss measuring equipment. When it comes to QC, there is no batch or statistical quality checking of our discs. Every single disc is measured and our machining tolerances are up to three times tighter than the industry norm.
Disc Surface Finish
All discs are coated with a proprietary black surface coating. The discs are chemically de-greased before the application to ensure no machining fluids or other contaminants are present on the discs as these can get absorbed by the pads and negatively affect brake performance. The coating is able to withstand high temperatures and is flexible enough to expand and contract without flaking or peeling. The discs require no cleaning or preparation before install. The black coating will be removed by the brake pads in the tracked area within a few brake cycles, while the unwept areas will remain coated, providing additional corrosion protection and an attractive appearance.
Disc Maximum Temperature Recording (MTR) System
Our MTR system provides permanent a permanent record of peak operating temperatures reached by the discs under actual driving. This information is extremely valuable when selecting the correct pad compound for your application. Each tab will change color when the temperature range is met. The longer red tab will provide a color gradient chart to further refine specific temperatures. Blue turns brown at 527 F. Green turns white at 860 F. Orange turns yellow at 1022 F. Pink turns white at 1166 F. Lastly the longer red strip turns various shades from 219 F to 2318 F.