VW Golf Mk4 1.4 16v - Years of manufacture 99 > 03. EBC Ultimax Brake Discs - Ultra Quiet Sport Slotted Brake Rotors. EBC Part Number = USR816. These are Solid Discs. The narrower multi-slot design and the progressive angle at which the slots are machined creates a quiet running sport rotor that still has the benefits of removing gas, dirt, water and debris and maintaining parallel pad wear.