XYZ Racing Hollow Rear Brake Kit — Audi S4 B8 QUATTRO (4D/5D)(TYPE I) (2011-2015)

The B8 S4’s supercharged 3.0 TFSI sits ahead of the front axle, so the quattro chassis already carries its mass over the nose, and under hard braking even more load pitches forward, leaving the rear axle underworked yet still prone to heat-soak once the factory discs have taken a few hard stops. The XYZ Racing Hollow Rear Brake Kit for the Audi S4 B8 Quattro (2011-2015) tackles the rear end specifically: vented two-piece floating discs and a forged caliper that restore thermal headroom where the standard rear setup runs thin.

This is a rear-axle upgrade for owners who have felt the pedal go long after a quick session or a fast mountain descent. It keeps the rear contributing its share of the stopping work instead of handing everything to the fronts, which is exactly where a heavy AWD saloon like the B8 S4 loses its composure under repeat braking.

What this brake kit does for your 2011-2015 Audi S4 B8 Quattro

The two-piece floating disc pulls rotating and unsprung mass off the rear axle while its hollow internal vanes open up cooling, so the discs shed heat faster between corners. You feel that as a firmer, more consistent pedal on the third and fourth hard stop, not just the first. Pad compound choice, Street, Sport or Racing, lets you match bite and temperature range to how the car is actually used, from quiet road manners through fast road to full track days. Braided lines hold the pedal firm under heat. Better rear thermal capacity also steadies the car’s brake balance, so the nose-heavy quattro front end isn’t left doing all the work and the chassis stays settled into a corner.

About the Hollow rear brake kit

The kit pairs a forged caliper with vented two-piece floating discs sized for the rear of the B8 platform. The caliper is hollow-bodied as standard, and the hollow disc vanes serve two purposes at once: lower mass and more surface area for cooling air to move through, which is what keeps temperatures in check during repeated heavy braking. Three pad compounds are offered, Street for quiet everyday driving, Sport for spirited road use and light track work, and Racing for track sessions, so the friction material suits the duty cycle rather than forcing a single all-rounder. Calipers come finished in Red, Yellow, Gold, Black or Anodized Black at no extra cost, with a custom Pantone option. Braided lines are included, discs come drilled or slotted at the same price, and the centre bell can be upgraded to two-tone anodized in five colours or titanium. The design priority throughout is rear-axle braking that holds up to harder, more frequent use than the original equipment was specified for.

Fitment for the Audi S4 B8 Quattro (4d/5d)(2011-2015)

This is a rear-position kit for the Audi S4 B8 Quattro in 4D and 5D body styles (Type I), covering the 2011 to 2015 model years, a pair of rear calipers and discs. Confirm your build year and body style before configuring.

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• Audi S4 rear caliper kit in Red, Yellow, Gold, Black or Anodized Black

Pick your pad compound and caliper colour and configure your kit using the options above when you order.