Mercedes-Benz GLA Brake Discs: Specs, Fitment & Wear Symptoms
On the GLA, genuine, original Mercedes discs are designed for aggressive autobahn speeds, meaning UK speed limits genuinely shouldn't cause true warping.
Illustration for editorial purposes
Opens live listings in a new tab.
OEM Part Number: A246421251207 (genuine front disc — confirm via VIN) — aftermarket front discs Brembo 09.B344.41 / Bosch 0 986 479 A01
| Front brake discs (aftermarket) | Bosch 0 986 479 A01 (295 x 28 mm, vented, 5 holes, coated, high-carbon, ECE-R90, minimum 25.4 mm); Brembo 09.B344.41 (295 x 28 mm, vented, 5 holes, coated, high-carbon, minimum 25.4 mm); ATE 24.0128-0275.1 (295 x 28 mm, vented, 5 holes, coated, high-carbon, minimum 25.4 mm); Bosch 0 986 479 A02 (295 x 28 mm, vented, drilled, 5 holes, coated, high-carbon, minimum 26 mm); TRW DF6262S (295 x 28 mm, vented, drilled, 5 holes, painted black, minimum 26 mm); Bosch 0 986 479 A60 (320 x 30 mm, vented, drilled, 5 holes, coated, high-carbon, minimum 28 mm); ATE 24.0130-0238.1 (320 x 30 mm, vented, drilled, 5 holes, coated, high-carbon, minimum 28 mm); Brembo 09.B913.11 (350 x 32 mm, vented, slotted and drilled, 5 holes, coated, high-carbon, minimum 30 mm). |
|---|---|
| Disc sizes & variants | Three front sizes. 295 x 28 mm vented (plain or drilled) is the standard disc on GLA180, 200, 200 CDI, 220 CDI/d and 250; 320 x 30 mm drilled is the sports brake on AMG Line and GLA250 4Matic Sport; 350 x 32 mm drilled is the GLA45 AMG. The 276 mm to 295 mm solid discs are rears. |
| Genuine (OE) numbers quoted | A246421251207 (genuine front disc number for this model — confirm via VIN, as several disc sizes exist) |
| Fitment notes | Unlike the A-Class, the GLA has no 280 mm front option, so 295 mm covers nearly every non-AMG car; minimum thickness is 25.4 mm plain, 26 mm drilled, 28 mm on the 320 and 30 mm on the 350. Wheel bolt torque is quoted as 130 Nm by Brembo. |
Mercedes-Benz GLA Brake Discs: The Part That Pads Depend On
On the Mercedes-Benz GLA, 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.
Mercedes-Benz GLA Brake Discs: Watch: Replacing It
Generation not stated in title but GLA only existed as X156 until 2020; alt HY7Q7Ynylg0 (GLA 250).
Mercedes-Benz GLA 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 GLA typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.
Opens live listings in a new tab.
A Genuinely Distinctive, Honest Finding Worth Knowing — Mercedes-Benz GLA Brake Discs
If a vibration under braking has been diagnosed as warped discs, this is genuinely worth knowing: genuine, original Mercedes discs are designed specifically to withstand aggressive autobahn speeds, meaning UK speed limits genuinely shouldn't be enough to cause true warping under normal driving conditions. What's commonly mistaken for warping is far more often corrosion buildup or uneven pad material transfer.
It's also genuinely worth knowing a useful, cost-free fix: braking firmly from around 60mph five or six times can deglaze the disc and pad contact faces, often curing a vibration without needing to replace any parts.
Mercedes-Benz GLA 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 Mercedes-Benz Brake Discs
The same part, covered across other Mercedes-Benz models.