XYZ Racing Hollow Rear Brake Kit — Mercedes Benz S CLASS W221 S 420 CDI (2005-2013)

The W221 S 420 CDI is one of the heaviest cars this kit is built for: a full-size luxury saloon carrying the OM629 4.0-litre twin-turbo V8 diesel and its mountain of low-down torque over the front axle. All that kerb weight has to be washed off somewhere, and on a long autobahn-pace cross-country run the rear axle takes more of that load than most owners expect. Standing on the brakes from three-figure cruising speeds, repeatedly, is exactly where a stock rear setup on a two-tonne barge starts to go soft.

The XYZ Racing Hollow Rear Brake Kit gives the W221 a rear end that holds its bite when the car is fully loaded and worked hard. It is a rear big brake kit aimed at owners who actually drive these cars at pace rather than waft, and who want the pedal to feel the same on the tenth heavy stop as it did on the first.

What this big brake kit does for your 2005-2013 Mercedes Benz S Class W221 S 420 CDI

After fitting, the first thing you feel is a firmer, more consistent rear contribution under hard braking, which settles the back of this long-wheelbase saloon and keeps it composed when you brake deep into a slip road or roundabout. The two-piece floating discs trim rotational mass at the rear hubs, which helps the heavy W221 react more honestly to inputs. With three pad compounds to choose from, you can match the kit to how you use the car: Street for quiet daily running, Sport for harder fast-road work with more bite and heat range, and Racing for sustained high-temperature use. The result is a rear axle that resists fade and gives you the confidence to lean on the brakes with a full diesel S-Class underneath you.

About the Hollow rear brake kit

The Hollow rear brake kit is named for its hollow-vane two-piece floating disc, which reduces rotational and unsprung mass at the rear of the car compared with a solid factory disc. It is supplied as a matched rear-axle package, a pair of rear calipers and discs, with a choice of three pad compounds: Street as the quiet, low-dust default, Sport for more bite and heat range, and Racing for sustained high-temperature work. 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. Discs are drilled or slotted at the same price, with two-tone anodized or titanium centre bells selectable. Caliper finishes run from no-cost Red, Yellow, Gold, Black and Anodized Black through premium polished-forged Titanium, Polished Gold and Polished Silver, candy Teal, Blue, Red and Orange, or a Custom Pantone for 150 pounds, letting you tie the brake hardware to the look of the car behind the wheels. The design priority is thermal stability and repeatable pedal feel on a heavy platform, rather than chasing outright initial bite at the expense of consistency.

Fitment for the Mercedes Benz S Class W221 S 420 CDI (2005-2013)

This kit is specified for the rear axle of the Mercedes Benz S Class W221 in S 420 CDI trim, covering the 2005 to 2013 production span. Confirm your exact chassis code and model year against the buying options before ordering, and pair the pad compound and caliper colour to your intended use.

What buyers also search for

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• W221 S 420 CDI big brake kit with Racing pad compound for repeated heavy stops
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• Hollow-vane rear disc kit to cut rotational mass on a heavy diesel S-Class
• S 420 CDI rear brake kit that keeps a consistent pedal when the car is fully loaded

Choose your pad compound and caliper colour from the options above when you order your rear big brake kit for the W221 S 420 CDI.