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

The B8 S4 carries its supercharged 3.0 TFSI weight over the front axle, so the rear brakes spend most of their life as the supporting act. Push the car on a track day, though, and that rear axle starts to matter: heat builds in the standard discs, the pedal lengthens, and the brake balance you trusted on the road quietly shifts. The XYZ Racing Hollow Rear Brake Kit for the Audi S4 B8 2WD (4D/5D)(TYPE II) is built to address exactly that.

This is a rear-axle upgrade aimed at restoring thermal headroom and keeping the back of the car composed under repeated stops. The two-piece floating disc trims rotating mass, and the three pad compounds, Street, Sport and Racing, let you match the kit to how hard you actually drive, from fast-road duty to sustained circuit work.

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

Fit the kit and the first thing you notice is a firmer, more consistent pedal once the brakes are warm, with the rear discs shedding heat faster so the bite point stops wandering deep into a session. On a heavy car like the S4, that rear thermal capacity matters more than the headline figures suggest: it stops the front axle from shouldering the entire load and keeps the chassis settled on corner entry. The Racing pad compound gives you stronger bite for circuit use, the Sport compound suits hard road and light track work, and the Street compound keeps cold-brake response and dust manageable for daily driving. Braided lines hold the pedal firm as the fluid warms. Pick the caliper finish to suit the build, with Red, Yellow, Gold, Black or Anodized Black at no extra cost, or a custom Pantone colour, so the upgrade reads as deliberate behind the wheels.

About the Hollow rear brake kit

The Hollow line is built on a two-piece floating rotor with hollow internal vanes, where material is removed to cut rotating and unsprung mass without giving up swept area, and a forged caliper that is hollow-bodied as standard. Less rotating mass at the rear means the brakes accelerate and slow more willingly with the wheel, which helps both pedal feel and the way the rear suspension follows the road. As a rear-specific kit it pairs naturally with a front big brake upgrade, letting you set front-and-rear balance rather than overworking one end. Pad choice is central to the system: the Street compound covers quiet, low-dust road use, the Sport compound adds bite and fade resistance for spirited driving, and the Racing compound is aimed at track sessions where heat is the limiting factor. Caliper colour is configurable across five included options, plus a custom Pantone finish, and the kit adds braided lines, drilled or slotted discs at the same price, and a centre bell that upgrades to two-tone anodized in five colours or titanium.

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

This kit is specified for the Audi S4 B8 2WD (4D/5D)(TYPE II) across the 2011 to 2015 model years, covering both the four-door saloon and five-door Avant body styles indicated by the 4D/5D designation. It fits the rear axle, as a pair of rear calipers and discs. Confirm your exact build year and body style before ordering so the disc and caliper sizing match your car.

What buyers also search for

• Audi S4 B8 rear brake upgrade for road and track use
• S4 B8 rear big brake kit with Street, Sport or Racing pad compounds
• Audi S4 B8 2WD rear disc kit to balance a front big brake upgrade
• S4 B8 caliper colour options including Red, Black, Gold and custom Pantone finishes
• Audi S4 B8 rear brakes that hold up to repeated track sessions

Specify your pad compound and caliper colour, then build your Audi S4 B8 rear brake kit using the options above when you order.