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

The B8 S4 hangs a supercharged 3.0 TFSI ahead of the front axle and drives all four corners through quattro, which leaves the rear brakes as the junior partner to a hard-working front end. The XYZ Racing Hollow Rear Brake Kit for the Audi S4 B8 Quattro (4d/5d)(type II) rebalances that relationship, adding heat capacity and bite at the back where the standard rear setup runs short on a committed road or track drive.

This is a rear-axle upgrade rather than a cosmetic one. It pairs lighter two-piece floating discs with a forged caliper and a choice of pad compounds, so you can match the back of the car to whatever the fronts are doing. On a 1,700kg-plus quattro saloon or Avant that leans hard on its tyres, that rear consistency is what keeps the S4 settled as you trail the brake into a corner.

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

The first thing you feel is a firmer, more progressive pedal under repeated heavy stops. The two-piece floating rear discs shed heat faster than the factory items, so the rear axle stops fading on a long downhill B-road or a run of quick corners. Three pad compounds, Street, Sport and Racing, let you set rear bite for daily use, fast road or a track day. Because the back of the car now holds its temperature, the quattro system has a more stable platform to put power down on corner exit. Braided lines keep the pedal firm under heat. You also gain a cleaner front-and-rear brake balance, which steadies the nose under trail braking instead of letting the S4 wash wide.

About the Hollow rear brake kit

The kit centres on a two-piece floating disc: material is removed from the rotor and routed through hollow internal vanes to cut rotating and unsprung mass at the rear axle. The forged caliper is hollow-bodied as standard. On a heavy AWD saloon that lower mass sharpens response and eases the load each stop puts through the hubs and bearings. The disc is clamped by the caliper finished in your choice of Red, Yellow, Gold, Black or Anodized Black at no extra cost, or a custom Pantone shade, so the upgrade reads as deliberate behind an open wheel. Pad choice spans Street, Sport and Racing compounds, taking the kit from a quiet commute to repeated track sessions. 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. As a rear-specific kit it is built to complement a front brake upgrade, or simply to restore proper balance to a car whose standard rear brakes were never its strong point.

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

This kit is cut for the B8-platform Audi S4 quattro in type II specification, covering both the 4d saloon and 5d Avant body styles built between 2011 and 2015. It addresses the rear axle only, as a pair of rear calipers and discs. Confirm your body style and build year before configuring, and check it alongside any front brake upgrade already fitted.

What buyers also search for

• Audi S4 B8 rear brake upgrade for road and track use
• Two-piece floating rear discs for an S4 quattro that resist fade on repeated stops
• 2011-2015 Audi S4 rear caliper colour options including a custom Pantone finish
• S4 B8 brake balance correction for a nose-heavy quattro
• Rear brake kit pad compounds for daily driving through to track days

Choose your pad compound and caliper colour, then build your S4 B8 rear setup using the options above when you order.