XYZ Racing Hollow Rear Brake Kit — Mercedes Benz S CLASS W221 S 300 (2005-2013)

The W221 S-Class carries close to two tonnes of luxury saloon over its rear axle, and that mass is exactly what punishes a standard rear brake on a long motorway descent or a repeated series of hard stops. The XYZ Racing Hollow Rear Brake Kit for the Mercedes Benz S Class W221 S 300 (2005-2013) adds rear braking capacity built to shed heat rather than store it.

This is the rear half of a big brake upgrade for owners who want the S 300 to stop with the composure its weight demands. The two-piece floating discs trim rotating and unsprung mass at the rear, and three pad compounds let you match the hardware to how the car is actually driven.

What this brake kit does for your 2005-2013 Mercedes Benz S Class W221 S 300

Fit it and the first thing you notice is a firmer, more progressive rear pedal under heavy braking, where the factory setup on a heavy W221 tends to go long and vague once heat builds. The hollow-vane disc design lowers rotating mass at the rear axle, which sharpens response and takes a useful bite out of unsprung weight on each corner. On long descents or motorway slip-roads taken quickly, the extra thermal headroom keeps the rear brakes consistent instead of fading as the discs soak up energy. The Racing pad compound tolerates repeated hard stops, while the Street and Sport compounds keep cold bite, dust and low-speed manners friendly for daily and fast-road use. Caliper colours run from no-cost Red, Yellow, Gold, Black and Anodized Black through to premium polished-forged and candy finishes, so the hardware can stay hidden behind the wheels or be made a feature.

About the Hollow Rear Brake Kit

XYZ Racing’s Hollow Rear Brake Kit is a rear-axle upgrade that pairs a two-piece floating disc with a fixed caliper to raise heat capacity and cut weight over a tired factory rear setup. The hollow-vane rotor is the defining detail: removing material from inside the disc lowers its rotating mass while preserving the swept area needed to absorb braking energy. The caliper body is hollow as standard, with an optional Hollow Racing upgrade for serious track use, rated to 1000C with no dust cover and a two-year warranty. Three pad compounds are offered: Street as the quiet, low-dust default, Sport for more bite and heat range, and Racing for sustained high-temperature work. Discs are drilled or slotted at the same price, with two-tone anodized or titanium centre bells selectable, and caliper finish runs from the five no-cost colours through premium polished-forged Titanium, Polished Gold and Polished Silver, candy Teal, Blue, Red and Orange, or a Custom Pantone for 150 pounds. As a rear-specific kit it is designed to balance an uprated front or to address rear brake fade on a heavy saloon that does more stopping work than its base spec suggests.

Fitment for the Mercedes Benz S Class W221 S 300 (2005-2013)

This kit is cut for the W221-generation S-Class in S 300 trim, covering the 2005 to 2013 model years. It is a rear-axle fitment, so consider the matching front kit for a balanced front-and-rear upgrade. Check your exact build year against the W221 range before ordering so the S 300 designation matches the chassis you own.

What buyers also search for

• Mercedes Benz S Class W221 rear big brake kit for a heavy luxury saloon that needs more thermal headroom
• W221 S 300 rear brake upgrade with hollow-vane discs to cut rotating mass
• S Class W221 brake kit with Street, Sport and Racing pad compound options
• Mercedes W221 rear brake fade fix for long motorway descents
• XYZ Racing hollow rear brake kit caliper colour choices for the S 300

Pick your pad compound and caliper colour for the S 300 from the options above when you order your kit.