The front kits (83.113.6800.xx) include a pair of slotted or drilled 380x32 floating directional AeroRotors with billet aluminum AeroHats patented for their ability to provide cooling airflow paired with forged, high performance patented ST-60 six piston front calipers.
The rear kits (83.113.0047.XX) sport 355x32 rotors and ST-40 four piston calipers with the same performance-focused features plus ST-10 parking brake calipers.
All StopTech Big Brake Kits also include billet aluminum mounting brackets with stainless steel hubs, DOT-compliant stainless steel braided Teflon brake lines, and high performance street pads for shorter stopping distances, better brake modulation, firmer pedal feel and less brake fade resulting in stronger, more reliable performance on and off the track.
The Audi RS4 was first released in 1999. The original version (B5) was only produced as a five-door five-seat "Avant," which was Audi's name for a estate car/station wagon. The "RS" initials are taken from RennSport – literally translated as "racing sport" from German.
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