BMW 1 Series Brake Discs: Specs, Fitment & Wear Symptoms
On the 1 Series, what's commonly called "warped discs" is genuinely almost always uneven pad deposits, since cast iron is genuinely hard to warp.
Illustration for editorial purposes
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OEM Part Number: 34118848417 (genuine front disc — confirm via VIN) — aftermarket front discs Brembo 09.C350.11 / Bosch 0 986 479 C93
| Front brake discs (aftermarket) | Brembo 09.C350.11 (307 x 24 mm, vented, 5 holes, coated, high-carbon, min 22.4 mm); Bosch 0 986 479 C93 (307 x 24 mm, vented, 5 holes, coated, high-carbon, min 22.4 mm); ATE 24.0124-0260.1 (307 x 24 mm, vented, 5 holes, coated, high-carbon, min 22.4 mm); TRW DF6747S (307 x 24 mm, vented, 5 holes, black painted); Brembo 09.C351.11 (330 x 24 mm, vented, 5 holes, coated, high-carbon, min 22.4 mm); Bosch 0 986 479 C94 (330 x 24 mm, vented, 5 holes, coated, high-carbon, min 22.4 mm); TRW DF6749S (330 x 24 mm, vented, 5 holes, black painted); Zimmermann 150.2930.52 (330 x 24 mm, vented, 5 holes, Sport Coat Z coated, high-carbon, drilled, min 22.4 mm) |
|---|---|
| Disc sizes & variants | Two front sizes, 307 mm and 330 mm, both 24 mm thick. The 307 mm disc is the standard fitment on the 116i, 118i, 116d and 118d; the 330 mm disc goes on the 120d, 120d xDrive and M135i xDrive (with M Sport brakes). |
| Genuine (OE) numbers quoted | 34118848417 (genuine front disc number for this model — confirm via VIN, as several disc sizes exist) |
| Fitment notes | Minimum thickness is 22.4 mm for both sizes. Zimmermann 150.2929.52 is the drilled 307 mm option and febi 104104 (307 mm) is the coated budget disc. Ridex 82B1772 (307 mm) is uncoated and carries a build-date limit of November 2016 that predates the F40, so it is best avoided. |
BMW 1 Series Brake Discs: The Part That Pads Depend On
On the BMW 1 Series, discs and pads work as a pair, and neglecting one tends to accelerate wear on the other — which is exactly why worn discs so often get discovered during what was meant to be a routine pad change.
BMW 1 Series Brake Discs: Watch: Replacing It
Generation not stated in title, almost certainly F20; only F40-specific video found is pads-only (U7J81NXSSKg).
BMW 1 Series Brake Discs: What They Do
Brake discs provide the surface the brake pads clamp against to slow the car, converting momentum into heat through friction. Larger, sportier trims of the 1 Series typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.
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A Genuinely Important, Honest Clarification Worth Knowing — BMW 1 Series Brake Discs
If a vibration under braking has been diagnosed as warped discs, this is genuinely worth knowing: what's commonly described as "warped discs" is, in reality, almost always caused by uneven deposits of pad material on the disc surface, since cast iron itself is genuinely difficult to warp under normal driving conditions.
It's also genuinely worth knowing a useful fix worth trying: thoroughly cleaning the mating surfaces between the wheel hub and the disc, or better still fitting new hubs entirely, has been documented resolving this kind of persistent vibration.
BMW 1 Series Brake Discs: Wear Symptoms, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Brake Discs Guide for warning signs to watch for, confirming fitment against your VIN, and choosing a reliable aftermarket disc.
More BMW Brake Discs
The same part, covered across other BMW models.