In Hong Kong, there's a (barely) underground cottage industry of high-end brake knockoffs. Protecting yourself from counterfeit parts is actually easy, according to Brembo.
Usually there will be one brake line going through a T-fitting to both rear wheels. You can locate the speed sensor by looking for an electrical connection near the differential on the rear-axle housing. ABS Questions Should I pump the brake pedal when stopping in slippery conditions?