The 09.C127.33 is the 390 mm Dual Cast front disc from Brembo’s Prime line for the W222-generation Mercedes-Benz S-Class, including the S63 and S65 AMG cars and the Maybach S650. Dual Cast means the high-carbon iron braking ring is cast directly around an aluminium hat, the bond is made in the foundry, not with pins or bolts. On a disc this large the aluminium hat removes a meaningful amount of rotating, unsprung mass while the friction surface remains iron and keeps iron’s behaviour at temperature. The bi-material joint also allows the ring to grow radially as it heats, which limits the coning that lengthens pedal travel on a heat-soaked one-piece disc.
Brembo publishes a second Dual Cast disc, 09.B848.33, to identical dimensions, 390 mm diameter, 36 mm thick, 64.5 mm height, 67 mm centering bore, 5 holes, but for the AMG C63, E63, GLC63, SL63 and AMG GT cars. The two are separate part numbers with separate applications; they cannot be told apart with a tape measure, so select from the fitment list below. The matching rear disc for these cars is 09.C128.33.
| Product Line | Brembo Prime |
| Position | Front |
| Construction | Dual Cast — high-carbon iron ring with cast-in aluminium hat |
| Finish | Bi-material, corrosion treated |
| Outside Diameter | 390 mm |
| Thickness (New) | 36 mm |
| Minimum Thickness | 33 mm |
| Overall Height | 64.5 mm |
| Centering Bore | 67 mm |
| Bolt Holes | 5 |
| Disc Type | Ventilated |
| Type Approval | ECE R90 |
| EAN | 8020584316351 |
| Part Number | 09.C127.33 |
This part fits:
| Year | Make | Model |
|---|---|---|
| 2018-2020 | Mercedes-Benz | Maybach S650 |
| 2020 | Mercedes-Benz | S450 |
| 2020-2021 | Mercedes-Benz | S560 |
| 2020 | Mercedes-Benz | S560e |
| 2014-2021 | Mercedes-Benz | S63 AMG |
| 2015-2020 | Mercedes-Benz | S65 AMG |
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