3) The Cost
If a product passed off as Brembo is sold at a price that is decidedly too low compared to the price exercised by other vendors for the same type of product, ask yourself why it has been discounted. It could be a warning of an attempt to sell a fake: it is less expensive because it is shoddy and the Brembo brand was affixed on it fraudulently. If in doubt, ask the salesperson the reason for the unusual discount.
Obviously, you must bear the type of sales channel in mind. In certain situations, on-line vendors, for example, are likely to offer more competitive prices than traditional vendors for the same Brembo original products.