XYZ Racing Hollow Rear Brake Kit — Audi S4 B8 2WD (4D/5D)(TYPE I) (2011-2015)

The B8 S4 carries its mass well forward of the front axle, which means the rear brakes spend most of their life as a balancing act rather than the headline stopper. Get the rear under-specified and you feel it as a vague, long pedal after three hard stops and a car that refuses to settle on corner entry. The XYZ Racing Hollow Rear Brake Kit is aimed squarely at that problem on the 2011-2015 S4 B8.

It pairs a lighter two-piece floating rotor with a forged caliper and a choice of pad compound, so the rear axle keeps contributing consistent bite as temperatures climb. Specified as a rear upgrade for fast-road and circuit use, it is the half of the brake system most owners ignore until a trackday exposes it.

What this rear brake kit does for your 2011-2015 Audi S4 B8 2WD (4D/5D)(TYPE I)

The two-piece floating rotor strips rotating and unsprung mass from each rear corner, which sharpens how quickly the car responds to the brakes and takes load off the dampers over kerbs and broken surfaces. Because you choose the pad compound when you order, Street, Sport or Racing, you can match the rear bite to how you actually use the car, from a Street setup that stays quiet and clean to a Racing compound that holds friction through repeated heavy stops. On a heavy, torque-rich S4 that translates to a firmer, more repeatable pedal and a rear axle that stays composed deep into a braking zone instead of fading and shoving the balance forward. The forged caliper resists flex under load, so pedal feel holds as the pads and fluid heat up, and braided lines keep the pedal firm. Caliper finish is your call, with Red, Yellow, Gold, Black or Anodized Black at no extra cost, or a custom Pantone colour behind the wheels.

About the Hollow rear brake kit

XYZ Racing builds this as a rear-axle big brake kit rather than a front-biased showpiece, which matters on a car whose front end already does the heavy lifting. The two-piece floating disc is the defining feature: the rotor is lightened to cut rotating mass while keeping usable thermal capacity, with hollow internal vanes so the rear can shed heat across a session without dragging the whole system into fade. The forged caliper is hollow-bodied as standard and clamps the disc evenly for a stiffer, more linear pedal than a sliding arrangement gives. Three pad compounds cover the realistic spread of use, with Street for ordinary low-dust road driving, Sport for spirited fast-road work and light track, and a Racing compound for trackday temperatures. The kit is sold per fitment, so the disc, caliper and bracketry are specified for the rear of this chassis rather than adapted from a universal part. 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. Colour options let the calipers either disappear or stand out behind the S4’s wheels.

Fitment for the Audi S4 B8 2WD (4D/5D)(TYPE I) (2011-2015)

This kit is specified for the rear axle of the Audi S4 B8 2WD (4D/5D)(TYPE I) across the 2011 to 2015 model years, covering both the 4-door and 5-door body styles noted in the fitment. It is a pair of rear calipers and discs. Confirm your chassis code and build year before ordering, since the rear bracketry is matched to this specific platform.

What buyers also search for

• Audi S4 B8 rear brake kit for fast-road and trackday use
• Two-piece floating rotor rear big brake kit that resists fade under repeat braking
• Audi S4 B8 rear brake upgrade with Street, Sport or Racing pad options
• Caliper colour choice for the rear of an Audi S4 B8
• 2011-2015 Audi S4 B8 brake kit specified per fitment rather than universal

Set your pad compound and caliper colour for the rear of your S4 B8 and configure yours using the options above when you order.