BMW 2 Series Brake Discs: Specs, Fitment & Wear Symptoms
On the 2 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 09.9750.21 / Bosch 0 986 479 213
| Front brake discs (aftermarket) | Brembo 09.9750.21 (284 x 22 mm, vented, 5 holes, coated, high-carbon, min 20.4 mm); Bosch 0 986 479 213 (284 x 22 mm, vented, 5 holes, coated, high-carbon, min 20.4 mm); ATE 24.0122-0239.1 (284 x 22 mm, vented, 5 holes, coated, high-carbon, min 20.4 mm); Brembo 09.B337.21 (312 x 24 mm, vented, 5 holes, coated, high-carbon, min 22.4 mm); Bosch 0 986 479 381 (312 x 23.9 mm, vented, 5 holes, coated, high-carbon, min 22.4 mm); ATE 24.0124-0203.1 (312 x 24 mm, vented, 5 holes, coated, high-carbon, min 22.4 mm); TRW DF4807S (312 x 24 mm, vented, 5 holes, black painted, high-carbon); Bosch 0 986 479 A06 (330 x 24 mm, vented, 5 holes, coated, high-carbon, min 22.4 mm) |
|---|---|
| Disc sizes & variants | Four front sizes, 284 mm, 312 mm, 330 mm and 340 mm. The 284 x 22 mm disc is the base fitment on the 218i and 218d, the 312 x 24 mm disc is the common fitment on the 220i, 220d and 225d, the 330 x 24 mm disc goes on the M Sport brake cars and the 235i/240i, and the 340 x 30 mm disc (febi 105724, drilled) is the M2 size. |
| 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 20.4 mm on the 284 mm disc, 22.4 mm on the 312 mm and 330 mm discs and 28.4 mm on the 340 mm disc. Brembo 09.B337.2X is the drilled 312 mm option and ATE 24.0324-0203.1 is the PowerDisc version; febi 30541 and Ridex 82B0273 are the coated budget 312 mm discs. |
BMW 2 Series Brake Discs: The Part That Pads Depend On
On the BMW 2 Series, discs and pads don't wear independently — neglect one and the other degrades faster too, which is exactly why what starts as a routine pad change frequently turns into a disc replacement as well.
BMW 2 Series Brake Discs: Watch: Replacing It
F22 M235i pads+rotors; alt prbDPoZOJeg (M2 discs onto F22 235i) is an upgrade not a like-for-like.
BMW 2 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 2 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 2 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 2 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.