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Big Brake Kit

XYZ Racing Hollow Rear Brake Kit — Mercedes Benz S CLASS W221 S 350 (2005-2013)

SKU: XYZ-BRK-BKR-ME-064-REAR

  • IncludesRear axle pair (2 discs + 2 calipers)
  • PositionRear
  • Disc Ø380–421 mm
  • Caliper pots8-pot
  • Lead time10–15 working days

Fits Mercedes Benz S CLASS W221 S 350 (2005-2013)

Brake pad compound

Street: quiet, low-dust, strong cold bite for road driving. Sport: higher temperature range and more bite for fast road and occasional track. Racing: maximum fade resistance for sustained track use (noisier and dustier cold). Match the pad to how hard you actually brake.

Disc size

Caliper grade

Hollow is the standard caliper: a lighter hollow-body forged caliper with a dust cover and a 5-year warranty. Hollow Racing drops the dust cover for sustained high-temperature use (rated to 1000°C, 2-year warranty) — the track-grade choice.

Caliper colour

Painted colours are included. Polished-forged finishes are mirror-polished forged calipers (Titanium, Gold, Silver); candy colours are a deep, mirror-reflection paint. Both are premium upgrades — fuller detail further down the page.

Painted — includedTell us the exact Pantone (PMS) code you want the calipers painted.Polished forgedCandy
Disc style

Drilled discs (cross-drilled holes) vent gas and water and look aggressive; slotted discs (surface grooves) wipe the pad face clean and resist fade under sustained hard use. Same price — choose on looks or how you drive.

Centre bell

The centre bell is the CNC-machined aluminium hat that joins the disc to the hub. Standard anodized is included; a two-tone bell adds an anodized accent ring in your choice of colour; titanium is the lightest, forged option.

Carbon-ceramic rotor

Carbon-ceramic rotors are a special-order track upgrade: far lighter than steel, fade-resistant at extreme temperatures and extremely long-lived. The price follows the disc size you choose above. The standard two-piece steel rotor is included.

Configured price£3,200.00Inc. VAT

Lead time: 10–15 working days from payment


£3,200.00

Made to order. Full payment is taken at checkout. Production begins once payment is confirmed.

Pay by card, Apple Pay, Google Pay — or Klarna on eligible orders.

Caliper render for this kit:

XYZ Racing Hollow Rear Brake Kit — Mercedes Benz S CLASS W221 S 350 (2005-2013) — 380 mm
380 mm

At close to two tonnes, the W221 S 350 leans hard on its rear axle every time that long bonnet dives under braking, and the factory rear discs were specified for refined, occasional stops rather than sustained heavy work. Load the car with passengers, point it down a long motorway descent or string together a few firm stops in quick succession, and the standard setup starts to feel vague and heat-soaked.

This XYZ Racing Hollow Rear Brake Kit for the Mercedes Benz S Class W221 S 350 (2005-2013) addresses exactly that. It is a rear-axle upgrade built to add thermal headroom and bite to a heavy executive saloon, with pad compounds and caliper finishes chosen to match how the car is actually driven.

What this brake kit does for your 2005-2013 Mercedes Benz S Class W221 S 350

The most noticeable change on a car this heavy is consistency: the rear axle holds its bite through repeated stops instead of going soft as temperatures climb. The hollow-vane disc design sheds rotational mass and helps the rotor release heat faster, which steadies pedal feel and keeps the car composed under hard deceleration. Pad choice lets you set the character. The Street compound keeps the refinement the S Class is known for, the Sport compound adds initial bite and heat range for spirited road use, and the Racing compound is there for the hardest, hottest work. The two-piece floating discs and fixed caliper also fill the rear wheel arch properly behind the W221’s larger wheels, with caliper colours ranging from no-cost Red, Yellow, Gold, Black and Anodized Black through premium polished-forged and candy finishes.

About the Hollow rear brake kit

The kit pairs two-piece floating, hollow-vane rotors with a fixed caliper to raise the rear axle’s heat capacity well above the standard Mercedes setup. The hollow-vane construction trims unsprung and rotating weight while opening internal area for cooling, so the disc recovers between stops rather than soaking and fading. 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, Sport and Racing, so the kit can be specified for quiet daily driving or for repeated high-temperature stops without swapping hardware. Discs are drilled or slotted at the same price, with two-tone anodized or titanium centre bells selectable. 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, letting you match or contrast the car’s wheels and trim. It is a bolt-on rear upgrade designed to bring braking performance and presence in line with a fast, heavy saloon.

Fitment for the Mercedes Benz S Class W221 S 350 (2005-2013)

This kit is built specifically for the W221-chassis S Class in S 350 specification, covering the 2005 to 2013 production span. It is a rear-axle fitment, intended to complement the front brakes on this platform for a balanced front-and-rear setup. Confirm your exact build year and trim against the W221 S 350 listing before you order.

What buyers also search for

  • Mercedes Benz S Class W221 S 350 rear big brake kit for heavy-car stopping power
  • W221 S 350 rear brake upgrade with hollow-vane discs to resist fade on long descents
  • Mercedes S Class W221 rear brake kit with selectable Street, Sport or Racing pad compounds
  • W221 S 350 coloured caliper options to fill larger rear wheels
  • Mercedes Benz S Class rear brake upgrade that keeps daily refinement

Choose your pad compound and caliper colour from the options above when you order your kit.

What’s in the kit

Rear axle kit — supplied as a complete bolt-on assembly.

  • 2×Two-piece floating discs — 380–421 mm: you pick the exact diameter with the "Disc size" option
  • 2×Lightweight aluminium centre bells
  • 2×Forged aluminium calipers — 8-pot
  • 2×High-stiffness mounting brackets
  • 2×Braided stainless steel brake lines
  • 4×High-performance brake pads (1 set)
  • 1×Fitting hardware & tools pack

Parking brake: Retains your original (OE) handbrake.

Choosing your spec

Every kit is built to order around the choices you make above. Here is what each option actually changes, so you can spec yours with confidence.

Brake pads — Street, Sport or Racing

Every kit ships with a full set of high-performance pads; the compound is your call.

Street is the right default for fast-road driving — a strong, progressive cold bite with low noise, low dust and long disc life. Sport raises the working temperature and adds bite and fade resistance for hard road use and the occasional track day, while still behaving on a cold morning. Racing is a track compound built for sustained abuse: huge fade resistance and bite once heat is in it, at the cost of more noise and dust when cold. Match the pad to how hard you actually use the brakes — there is no benefit to a race pad that never gets up to temperature.

Caliper grade — Hollow vs Hollow Racing

Hollow is the standard caliper on every kit: a hollow-body forged caliper, lighter than a solid one, fitted with a dust cover and backed by a 5-year oil-leak warranty. For most fast-road and spirited track use it is all the caliper you need.

Hollow Racing is the track-grade upgrade. It runs the same hollow body but without a dust cover (so there is nothing to melt at sustained high temperature), uses a twin-metal piston that isolates heat travelling from the disc to the oil seal, and is rated to 1000°C. Available 330–356mm (rear). Warranty is 2 years on oil leaks and 10 years on appearance. Built for professional racing and repeated track days.

Hollow Racing caliper

Caliper colour & finish

Painted colours (Red, Yellow, Gold, Black, Anodized Black) are included at no cost. Want an exact match to your car? Custom Color (+£150) paints the calipers to any Pantone code you supply (15–20 day lead time).

Polished Forged finishes are the flagship: a forged caliper given a mirror-polished surface treatment that shifts colour with the viewing angle. Beyond the looks, the polished surface dissipates heat better, resists rust and stands up to the weather. Choose Titanium (neochrome, +£350), Polished Gold (+£300) or Polished Silver (+£250). They look their best paired with a titanium centre bell. Care: clean only with a dilute neutral cleaner or water.

Candy colours (+£200) use a deep candy-paint and polishing process for a mirror-reflection, boutique finish — pick Teal, Blue, Red or Orange (shown below right).

Polished forged caliper finishes
Candy caliper colours

Centre bells

The centre bell is the CNC-machined aluminium hat that joins the disc to the hub. The standard anodized centre bell is included. The Two-tone bell (+£200) adds an anodized accent ring — choose Red, Yellow, Orange, Purple or Silver right here at checkout. The Titanium centre bell (+£500) is a forged titanium bell (bolts not included) that finishes off the polished-forged look.

Two-tone anodized centre bells
Same car

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