Big Brake Kit
XYZ Racing Hollow Front Brake Kit — Mercedes Benz S CLASS W221 S 550 (2005-2013)
SKU: XYZ-BRK-BKF-ME-066-FRONT
- IncludesFront axle pair (2 discs + 2 calipers)
- PositionFront
- Disc Ø330–444 mm
- Caliper pots6 / 8 / 12-pot
- Lead time10–15 working days
Fits Mercedes Benz S CLASS W221 S 550 (2005-2013)
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Caliper render for this kit:
At 2,100kg and with a 5.5-litre V8 dismissing standing traffic with ease, the W221 S 550 was never a car with modest thermal demands at the front axle. Mercedes fitted appropriately large front brake hardware from the factory, but that hardware was calibrated for the way most S-Class buyers drive, not for sustained descent work, repeated spirited junctions, or the increasingly common sight of a W221 at a track-day session. The XYZ Racing front big brake kit moves the performance ceiling for the 2005-2013 S 550 without altering the car’s essential character.
Supplied as a matched pair of left and right front calipers and two-piece floating discs, with a choice of pad compound, this kit can be specified to match actual usage rather than an aspirational one. A wide range of caliper finishes completes a package built to work with the W221’s imposing proportions and the oversized rim fitments most modified S 550s are already wearing.
What this brake kit does for your 2005-2013 Mercedes Benz S CLASS W221 S 550
The hollow-vane rotor targets the core challenge of stopping a heavy luxury saloon repeatedly without fade: thermal management under load. By keeping temperatures lower through successive hard stops, the disc holds bite precisely where the standard W221 system begins to telegraph its limits through increased pedal travel. The two-piece floating bell lets the friction ring expand without coning, and reduced rotating mass sharpens response. The S 550’s front axle carries the bulk of the deceleration load in any meaningful stop; given the engine mass ahead of the front axle centreline in this rear-wheel-drive platform, that weight transfer is concentrated and consistent. Street is the quiet, low-dust road default that preserves acceptable cold bite for commuter use; Sport adds bite and heat range for spirited driving; Racing is the track compound for sustained friction stability on circuit. Disc faces are offered drilled or slotted at the same price, so the visual result can match wherever the W221’s build has reached.
About the Front Brake Kit
The two-piece floating, hollow-vane rotor reduces rotating and unsprung mass relative to a standard vented disc, improving initial bite response and managing heat dissipation more effectively over repeated braking cycles, with the floating bell letting the friction ring grow without distortion. The kit is specified for the front axle only, the correct intervention point for a V8 platform where weight transfer under firm braking concentrates load at the front wheels. The caliper is hollow-bodied as standard, light and stiff to resist flex, with an optional Hollow Racing upgrade for committed track use that deletes the dust cover, is rated to 1000C, and carries a two-year warranty. Braided lines firm the pedal, and centre bells can be upgraded to two-tone anodizing in five colours or titanium at checkout. Pad compound is selected at order from Street, Sport, and Racing, so the characteristic is fixed before the kit goes on the car. Caliper finish runs from the included painted colours (Red, Yellow, Gold, Black, Anodized Black) at no extra cost, through a Custom Color in any Pantone for 150 pounds, to premium polished-forged and candy options, accommodating builds from OEM-adjacent to full-colour statement fitments.
Fitment for the Mercedes Benz S CLASS W221 S 550 (2005-2013)
This front big brake kit is confirmed for the Mercedes Benz S CLASS W221 S 550, covering the full production run from 2005 to 2013 and supplied as a left-and-right front pair. It addresses the front axle, targeting the end where the W221 S 550’s mass creates the greatest deceleration demand. Pad compound and caliper colour are confirmed via the options above before checkout.
What buyers also search for
- Mercedes Benz S Class W221 S 550 front brake upgrade for sustained high-speed and descent driving
- W221 S 550 big brake kit with Street, Sport, and Racing pad compound options for mixed use
- Mercedes S Class W221 two-piece floating front brake kit for improved fade resistance on a heavy platform
- S 550 W221 2005-2013 front brake kit with a full range of caliper colour choices including Custom Color
- Mercedes Benz W221 S 550 front brake upgrade that preserves daily driveability on a V8 luxury saloon
Choose pad compound and caliper colour from the options above; the full specification is confirmed in a single step before you add to cart.
What’s in the kit
Front axle kit — supplied as a complete bolt-on assembly.
- 2×Two-piece floating discs — 330–444 mm: you pick the exact diameter with the "Disc size" option
- 2×Lightweight aluminium centre bells
- 2×Forged aluminium calipers — 6 / 8 / 12-pot
- 2×High-stiffness mounting brackets
- 2×Braided stainless steel brake lines
- 4×High-performance brake pads (1 set)
- 1×Fitting hardware & tools pack
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 286–380mm (front). Warranty is 2 years on oil leaks and 10 years on appearance. Built for professional racing and repeated track days.
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).
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.
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