DB Guide Ultimate:~ It has been engineered to be light and powerful, with superior heat management capabilities, which gives you better, more consistent, more reliable braking‹everything you need when you're bashing through babyheads, approaching a drop, or just pointing your wheels toward destinations unknown. More adventures, fewer limitations. Follow the leader.
• New Bleeding Edgeª technology for quick, hassle-free bleeds (requires bleed adapter)
• All new S4 four piston caliper with superior heat management
• Proven Guide technologies