XYZ Racing Hollow Front Brake Kit — Audi S4 B6 (2002-2005)

Four and a quarter litres of naturally aspirated V8 ahead of the front axle, substantial quattro drivetrain mass, and an engine character that rewards extended high-speed work mean the B6 S4 puts considerably more through its front brakes than its saloon-car silhouette implies. The factory brake specification is adequate for ordinary road use, but circuit days or repeated hard mountain-road runs bring the thermal limits of the OEM hardware into sharp focus.

The XYZ Racing front big brake kit for the Audi S4 B6 addresses that limitation directly. It fits as a matched pair of front calipers and two-piece floating discs across the front axle, and the hollow-vane disc construction improves heat extraction from the friction surface, the core mechanism behind fade on a car of this weight and performance profile.

What this brake kit does for your 2002-2005 Audi S4 B6

On a nose-heavy quattro S4, the front axle absorbs the majority of the deceleration load on every hard stop. The hollow-vane discs circulate air through the rotor body rather than storing heat in it, lowering operating temperature and extending the window before pedal feel softens under sustained pressure. The two-piece floating construction lets the disc expand without warping the bell and trims rotating and unsprung mass off the front corners, and braided lines come as part of the kit to firm up the pedal.

Three pad compounds match the brake spec to use. Street is the quiet, low-dust default for a road car that rarely pushes the system to its limits. Sport covers the driver who uses public roads hard and occasionally visits a circuit. Racing is for the S4 that sees regular track sessions where operating temperature stays consistently elevated. The caliper finish matters on a B6 S4 where open-spoked factory alloys put it in constant view. Included painted colours are Red, Yellow, Gold, Black and Anodized Black at no extra cost.

About the front brake kit

The hollow-vane disc that names this kit is its principal performance argument. Where a standard ventilated disc manages heat by channelling airflow through radial vanes, the hollow-vane design introduces a secondary airflow path through the disc body itself, drawing thermal energy away from the friction face under sustained hard use. The calipers are hollow-bodied as standard for strength without excess weight, with an optional Hollow Racing upgrade for regular circuit use that drops the dust cover, is rated to 1000C and carries a two-year warranty.

Pad compounds span three specifications: Street for quiet everyday use, Sport for sharpened bite and improved heat tolerance on spirited road driving, and Racing for consistent response at elevated temperatures on circuit. Beyond the included painted finishes, a Custom Color in any Pantone is available, along with premium polished-forged Titanium, Polished Gold and Polished Silver and candy Teal, Blue, Red and Orange. Discs come drilled or slotted at the same price, and centre-bell upgrades, two-tone in five anodized colours or in titanium, are selectable at checkout. Front-only fitment makes this kit viable as a standalone front upgrade or as the first half of a full-axle programme.

Fitment for the Audi S4 B6 (2002-2005)

This kit is built for the B6-generation Audi S4 across its complete 2002-2005 production run. All B6 S4 variants were produced exclusively with quattro all-wheel drive during this period. Confirm wheel diameter is sufficient to clear the caliper before ordering, as large-diameter brake kits carry a minimum rim size requirement.

What buyers also search for

• Audi S4 B6 front brake upgrade for track days and fast-road use
• Audi S4 B6 2002-2005 big brake kit with selectable pad compounds
• B6 S4 hollow-vane disc brake kit for improved thermal management under load
• Audi S4 brake caliper finish options for open-spoked alloy wheels

Select your pad compound and caliper finish from the options above, and we build it to your spec.