BMW X3 Brake Discs: Specs, Fitment & Wear Symptoms

A genuinely alarming, honest account: a well-known fast-fit chain replaced "warping" discs three times in 11 months under warranty, suspected of using the cheapest available parts — plus a genuinely important clarification that "warped discs" is almost always uneven pad deposits, since cast iron is genuinely hard to warp.

Generation covered: this guide is for the third-generation X3 (G01, 2018–present), with particular focus on 2018–2023 registered examples now old enough for parts to be a common search. Check your logbook or VIN if you're unsure which generation you have.

Illustration for editorial purposes

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OEM Part Number: 34118054826 (genuine front disc — confirm via VIN) — aftermarket front discs Brembo 09.D904.13 / Bosch 0 986 479 F57

Accuracy note: Covers the BMW X3 (G01 2017 on) as listed in the UK aftermarket catalogues. Front brake discs are sold by diameter and thickness, and most models have two or three disc sizes depending on engine, brake size and trim — a 278 mm disc will not fit a car built with 300 mm brakes, so the caliper carrier and the disc must match. The references below are UK aftermarket catalogue listings for this generation, labelled by brand with diameter x thickness in mm; genuine numbers are shown only where a listing quotes one. Measure the old disc or check the brake size against your VIN before ordering, replace discs in pairs with new pads, and scrap any disc at or below its minimum thickness.

Front brake discs (aftermarket)	Zimmermann 150.2951.20 (330 x 24 mm, vented, 5 holes, Coat Z coated, high-carbon, min 22.4 mm); Brembo 09.D904.13 (330 x 24 mm, two-piece vented with aluminium hub, 5 holes, coated, high-carbon, min 22.4 mm); febi 173011 (330 x 24 mm, vented, 5 holes, coated, high-carbon, min 22.4 mm); Brembo 09.D905.13 (348 x 30 mm, two-piece vented with aluminium hub, 5 holes, coated, high-carbon, min 28.4 mm); Bosch 0 986 479 F57 (348 x 30 mm, two-piece vented, 5 holes, coated, high-carbon, min 28.4 mm); Zimmermann 150.2956.52 (348 x 30 mm, vented, 5 holes, Sport Coat Z coated, high-carbon, drilled, min 28.4 mm); ATE 24.0136-0133.2 / 24.0136-0132.2 (348 x 36 mm, two-piece vented, 5 holes, coated, high-carbon, min 34.4 mm, left / right pair); Zimmermann 150.2936.20 / 150.2937.20 (348 x 36 mm, vented, 5 holes, Coat Z coated, high-carbon, min 34.4 mm, left / right pair)
Disc sizes & variants	Two front diameters, 330 mm and 348 mm, in three distinct discs. The 330 x 24 mm disc is the standard fitment on the xDrive20i and xDrive20d, the 348 x 30 mm disc goes on the xDrive30i, xDrive30d and M Sport brake cars, and the 348 x 36 mm disc is the M40i / M40d fitment and is handed.
Genuine (OE) numbers quoted	34118054826 (genuine front disc number for this model — confirm via VIN, as several disc sizes exist)
Fitment notes	Minimum thickness is 22.4 mm on the 330 mm disc, 28.4 mm on the 348 x 30 mm disc and 34.4 mm on the 348 x 36 mm disc. The 348 x 36 mm discs come as separate left and right part numbers (ATE 24.0136-0133.2 left with 24.0136-0132.2 right; Zimmermann 150.2936.20 left with 150.2937.20 right; febi 171454 left with 171456 right). The X3 G01 shares its front discs with the 3 Series G20. No TRW, Ferodo or Ridex front discs are listed.

BMW X3 Brake Discs: The Part That Pads Depend On

On the BMW X3, 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.

Before you buy: disc size and design vary by trim, engine size and whether your car has the standard or "sport" brake package. Always confirm against your VIN before ordering.

BMW X3 Brake Discs: Watch: Replacing It

🎬 Watch: BMW X3 Front Brake Rotor & Pad Replacement DIY (2018-2023 BMW G01 X3 xDrive30i, sDrive30i)

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G01 front pads and rotors

BMW X3 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 X3 typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.

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A Genuinely Alarming, Honest Real Account Worth Knowing — BMW X3 Brake Discs

If discs keep "warping" repeatedly despite being replaced, this is genuinely worth knowing: one documented UK case saw a well-known national fast-fit chain replace the front discs and pads under warranty three separate times within just eleven months, since they kept warping according to the garage. The owner reasonably suspected the chain was using the cheapest available discs and pads, with a specific own-brand supplied by a parts wholesaler described directly by other owners as genuinely poor quality — worth getting a second, independent opinion if the same fault keeps recurring at a fast-fit chain rather than assuming the car itself has an unusual underlying problem.

A genuinely important, honest clarification worth knowing: what's commonly described as "warped discs" is, in reality, almost always caused by uneven deposits of pad material building up on the disc surface, since cast iron itself is genuinely difficult to warp under normal driving conditions. This distinction matters because it means simply fitting new discs repeatedly, without addressing the underlying cause of uneven deposits, won't necessarily resolve a recurring vibration.

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, recurring vibration in cases where simply replacing the discs and pads repeatedly hadn't worked.

BMW X3 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.