An example of this is the "rust removal" test which checks how clean the disc rotors are, and deliberately creates uneven surfaces. Our suppliers often claim that our requirements are too severe. Development usually starts with parts suppliers presenting their best sample brake pads that they have available, but this process rarely proceeds smoothly, as these brake pads need to be fine-tuned even further. The reason for this is that the brake pads provided by the suppliers simply do not match our specifications, and we need to achieve the right balance for performance. Suppliers are especially known to comment on the tough criteria that we require for quality, in areas such as abnormal noise, vibrations, and braking performance. While suppliers are confident in presenting their best samples, they simply do not meet our test criteria to qualify under SUBARU specifications. Another example is when we feel the need to improve fade-resistance, we know how to modify the required specifications as we have an enormous database of test codes that go back years. The result of this data is the exceptional level of performance found in our cars today, and this is why our suppliers tell us that our requirements and standards are too strict. If a supplier proposed to SUBARU a brake pad material that was already available, it would simply not be good enough. We consider maintaining such stringent requirements our asset, and the end result is the exceptional quality of our SUBARU brakes today.