The build: vehicle and parts
| Item | Spec on this car |
|---|---|
| Vehicle | Mercedes-Benz A45S AMG (W177) |
| Upgrade scope | Front-axle carbon ceramic conversion |
| Front rotors | STOPFLEX 350 mm carbon ceramic |
| Front caliper | OEM fixed multi-piston AMG caliper (retained) |
| Rear rotors | 330 mm high-carbon steel |
| Pads | STOPFLEX CCB-optimized ceramic compound |
| Wheel shown | 20-inch AMG Performance wheel |
| Rotor coating | Crackle-texture ceramic, rust-free finish |
Confirm the front caliper before you buy
A rotor-only conversion works only when the car already runs the correct OEM fixed multi-piston AMG front caliper, like the one shown here. If your front end uses a sliding or floating caliper, you need a full kit instead, because bracket geometry and pad fit have to match. And don't judge clearance by wheel diameter alone — spoke shape and the inner barrel matter as much as rotor size.
Why a front CCB upgrade works here
| STOPFLEX feature | Why it matters on the A45S | What you notice |
|---|---|---|
| 350 mm carbon ceramic front rotor | This hatch is nose-heavy under braking, so the front axle takes most of the heat and load. | A pedal that holds up on a long mountain descent instead of going soft after a few hard stops. |
| Rotor about half the weight of same-size steel | Front rotating and unsprung mass drives steering response and how the nose reacts over bumps. | A front end that feels quicker to turn in and less heavy at the nose. |
| Heat tolerance with stable friction | Repeated stops shrink the cooling window faster than a front-heavy car can shed heat with steel. | Friction near 0.4μ at normal temps, still around 0.3μ near 900°C — the tenth stop feels like the first. |
| Low-dust pads + rust-free coating | Multi-spoke AMG wheels show every speck of iron dust and brake rust film. | Cleaner wheels between washes and no orange staining after the car sits in the rain. |
| Long-fiber CCB construction | Street cars need a rotor that lasts, not a race disc you replace every season. | Street service life that can reach roughly 250,000–300,000 km when the car stays off track. |
| Normal cold-temperature bite | A daily-driven AMG sees cold starts, not a pre-warmed grid. | The first stop on a -20°C morning behaves like any other — no waiting for heat. |
What gets better
- Stronger heat headroom on the axle that actually overheats first
- Lighter front rotors for sharper turn-in and less nose weight
- Far less brake dust on the front wheels
- No rust film after rain, plus a brighter finish behind the spokes
- Long street life without track abuse
What to confirm first
- That the car has the OEM fixed multi-piston AMG front caliper
- Wheel clearance for your exact 19- or 20-inch design, not just diameter
- Spoke and inner-barrel profile around the caliper
- That a front-focused upgrade matches how you drive the car
- A proper bedding-in cycle at install
If you're not sure your car matches the spec shown here, send us your details and we'll confirm Mercedes-AMG A45S W177 fitment before you order through our Mercedes-Benz CCB collection.
Build gallery
A45S AMG brake upgrade FAQ
Why carbon ceramic up front and high-carbon steel in the rear on the A45S?
The A45S AMG (W177) loads its front axle hard under braking, so the front carries most of the heat and has the biggest say in how the nose feels. Carbon ceramic up front targets that thermal load and cuts rotating mass where you feel it most, while a 330 mm high-carbon steel rear keeps the package balanced for street use.
Do STOPFLEX carbon ceramic brakes feel weak when cold?
No. STOPFLEX carbon ceramic rotors are built to work at normal street temperatures, including cold mornings around -20°C on the first stop. They are not race-only discs that need heat in them before they bite.
Will a 350 mm STOPFLEX front setup clear factory 19-inch A45S wheels?
It clears many factory 19-inch AMG designs, but you have to confirm it before ordering. Rotor diameter is only one piece; spoke shape, the inner barrel profile, and caliper clearance all have to be checked against your exact wheel.
What does the STOPFLEX rotor coating actually do for me?
The crackle-texture ceramic coating gives a brighter finish behind the wheel, resists rust after rain, and stays cleaner over time. Pair it with low-dust STOPFLEX pads and wheel cleaning gets a lot easier.
Do STOPFLEX carbon ceramic rotors need bedding in?
Yes. A proper bedding cycle lays down an even pad transfer layer, cuts the chance of noise or glazing, and keeps braking stable across the rotor's long service life.
