Details: Brake pads form a vital part of the disc brake system. The friction material is applied onto the brake disc surface by the caliper pistons to generate the friction to stop the wheels turning. Brake pads are goverened by legislation known commonly as "REGULATION 90". They should be replaced when worn excessivley or when replacing the brake discs. Must be replaced in axle sets. Check for any other compnents to replace such as wear sensor leads or pad fitting pins.