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Big Brake Kit

XYZ Racing Hollow Rear Brake Kit — Mercedes Benz S CLASS W221 S 320 CDI (2005-2013)

SKU: XYZ-BRK-BKR-ME-070-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 320 CDI (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 320 CDI (2005-2013) — 380 mm
380 mm

The W221 S 320 CDI puts a great deal of mass over its rear axle, a long-wheelbase diesel limousine that asks plenty of its brakes every time it sheds motorway speed. The XYZ Racing Hollow Rear Brake Kit for the Mercedes Benz S Class W221 S 320 CDI is built to answer that, adding rear stopping capacity that holds up when a near-two-tonne saloon is hauled down again and again.

This is a rear-axle upgrade for owners who use the car the way it was meant to be used: long, quick cross-country runs and steep descents where the factory rear discs heat-soak and the pedal goes long. The two-piece floating disc trims rotating mass at the rear hub, and a choice of pad compounds lets you set the car up for road manners or harder use.

What this brake kit does for your 2005-2013 Mercedes Benz S Class W221 S 320 CDI

On a car this heavy, rear brake temperature is usually the limiting factor on a sustained descent or a run of high-speed stops. Refreshing the rear axle restores pedal feel and bite once the standard setup has begun to fade, and it shares the braking load more evenly so the fronts are not doing all the work. The kit lets you choose from three pad compounds: Street for quiet daily refinement, Sport for sharper response and more heat range when you are pressing on, and Racing for the hardest, hottest work. The hollow-vane discs shave rotating and unsprung mass at the rear, which the air-sprung S-Class rewards with cleaner body control. Calipers come finished at no extra cost in Red, Yellow, Gold, Black or Anodized Black, with premium polished-forged, candy and Custom Pantone finishes available to suit the car.

About the Hollow rear brake kit

The Hollow rear brake kit pairs a lightweight two-piece floating disc with a fixed caliper to lift thermal capacity and resistance to fade at the rear axle. The hollow-vane disc is the headline: it cuts rotating mass without giving up swept area, which helps the brakes recover heat between stops. 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, Street, Sport and Racing, let you tune the trade-off between cold bite, noise and high-temperature endurance. Discs are drilled or slotted at the same price, with two-tone anodized or titanium centre bells selectable. Caliper finishes run 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, covering everything from a factory-discreet look to something that shows through the wheel. It is engineered as a bolt-on rear solution for a heavy executive saloon rather than a stripped-out race car, so day-to-day usability stays intact.

Fitment for the Mercedes Benz S Class W221 S 320 CDI (2005-2013)

This kit is specified for the W221 chassis in S 320 CDI guise across the 2005 to 2013 production span. Confirm your exact build year against the range above before ordering, and check the rear wheel clearance noted with the buying options. Only the fitment data supplied here applies. Pad compound and caliper colour are selected when you order.

What buyers also search for

  • Mercedes Benz S Class W221 rear big brake kit for fast-road and motorway use
  • S 320 CDI rear brake upgrade that resists fade on long descents
  • W221 hollow-vane rear brake kit with Sport or Racing pad options
  • Mercedes S Class rear brake kit with coloured calipers (Red, Yellow, Gold and more)
  • Heavy saloon rear braking upgrade without losing daily refinement

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

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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