Big Brake Kit
XYZ Racing Hollow Front Brake Kit — Smart SMART ROADSTER W452 (2003-2005)
SKU: XYZ-BRK-BKF-SM-004-FRONT
- IncludesFront axle pair (2 discs + 2 calipers)
- PositionFront
- Disc Ø380–444 mm
- Caliper pots8 / 12-pot
- Lead time10–15 working days
Fits Smart SMART ROADSTER W452 (2003-2005)
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Caliper render for this kit:
Few production cars in the sub-800kg bracket share the W452 Roadster’s natural balance: engine behind the seats, rear-wheel drive, and a wheelbase short enough to make the car genuinely rotational at low speed. That layout means the front axle absorbs substantial load transfer under braking despite carrying no drivetrain weight, and the factory brake hardware, specified for light road use, becomes the limiting factor the moment the car is pushed near its potential.
The XYZ Racing Hollow Front Brake Kit for the Smart SMART ROADSTER W452 (2003-2005) answers that with a matched pair of front calipers and two-piece floating discs for the left and right corners. It is a single-axle kit aimed at the end of the car where braking load concentrates most, configured to your use through a choice of pad compound, disc style and caliper finish.
What this brake kit does for your 2003-2005 Smart SMART ROADSTER W452
Sub-800kg roadsters can make factory brakes feel marginal fast, not because the forces are large but because low thermal mass means repeated stops build heat quickly. The hollow-vane discs move cooling air through the rotor body continuously under load, holding disc temperatures out of the fade window that stock iron reaches early during a spirited backroad run. The two-piece floating discs pair an aluminium centre bell with an iron friction ring, keeping the discs true through repeated heat cycles and trimming rotating mass at the wheel. Less rotating and unsprung weight means the brakes pick up and release faster and the suspension settles more cleanly over surface changes.
Three pad compounds cover the realistic range of how W452 owners use the car. Street is the quiet, low-dust road default; Sport adds bite and heat range for the spirited use the Roadster’s neutral, rear-biased balance encourages; Racing is a full circuit compound for drivers chasing consistency across a longer session. Braided stainless lines are included for a firmer, more repeatable pedal than rubber hoses that swell under heat.
About the Hollow Front Brake Kit
The hollow-vane design describes the disc’s internal ventilation. Cooling channels run through the rotor body and draw air across the friction surfaces while the wheel turns, so heat sheds into the airstream rather than soaking into solid iron. The calipers are hollow-body as standard for stiffness without excess weight, and the kit covers the front axle as a pair because that is where the W452 concentrates its braking effort under deceleration.
Discs come drilled or slotted at the same price, so the choice is yours on looks or wet-weather feel. Included caliper finishes are Red, Yellow, Gold, Black and Anodized Black at no extra cost, with a Custom Color to any Pantone code for a small upcharge. Premium polished-forged finishes (Titanium, Polished Gold, Polished Silver) and candy finishes (Candy Teal, Candy Blue, Candy Red, Candy Orange) sit in a separate upgrade tier. Two-tone centre bells in five anodized colours, or a titanium bell, are selectable at checkout. For serious track use there is an optional Hollow Racing caliper, run without a dust cover, rated to 1000C and backed by a two-year warranty. On a car as compact and distinctive as the W452, the visible brake hardware is part of the build.
Fitment for the Smart SMART ROADSTER W452 (2003-2005)
This kit covers the Smart SMART ROADSTER W452 across its full production run from 2003 to 2005 and fits the front axle as a left-and-right pair. Confirm the W452 chassis designation against your vehicle registration document before ordering. Pad compound, disc style and caliper finish are all selected when you order.
What buyers also search for
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Pick the compound, disc style and finish that suit how you use the car when you order, and the W452 front kit is built to your spec.
What’s in the kit
Front axle kit — supplied as a complete bolt-on assembly.
- 2×Two-piece floating discs — 380–444 mm: you pick the exact diameter with the "Disc size" option
- 2×Lightweight aluminium centre bells
- 2×Forged aluminium calipers — 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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More XYZ products for the Smart SMART ROADSTER W452 appear here as the rest of the range publishes.