Second Hand Mercedes-Benz GLS Brake Discs

The Mercedes-Benz GLS moved from the first generation (X166, 2016–2019) to the second generation (X167, 2019 onwards), so a 2017 and a 2020 are from different generations with different platforms and running gear. Brake disc dimensions are unlikely to be the same across that generational boundary, and you should confirm exact compatibility with the breaker against your registration before buying. Never assume a disc from one generation will cross over to the other.

Engine size genuinely matters for brake disc fitment on the GLS, as larger or more powerful variants are often fitted with bigger brakes to handle the extra weight and performance. The 350d and 400 are different outputs with potentially different disc diameters or caliper configurations, so you should tell the breaker your exact engine variant and registration rather than assuming they interchange. This is one case where engine size is worth double-checking, not ignoring.

AMG Line is a styling and equipment package rather than a mechanical upgrade, so it does not typically change the brake disc specification compared to an equivalently engined standard GLS. What actually matters is your engine size and generation (X166 or X167), not whether the car has AMG Line badging. Tell the breaker your engine variant and registration and they can identify the correct disc — trim name alone is not enough.

Yes, front and rear brake discs are different parts with different diameters and thicknesses, so you must specify which axle you need. On the GLS, front discs are typically larger than the rears, as is standard on most vehicles. Be clear with the breaker whether you need the front or rear, and always quote your registration so they can confirm the exact size for your variant.

The GLS X166 (2016–2019) is a renamed and mildly updated version of the GL X166 (2012–2015 facelift), and some running gear was shared across those years, but disc fitment can vary with engine output and build date changes within the same platform. Whether a GL disc will fit your GLS is something you should confirm with the breaker against both registrations rather than assuming they are identical. The engine variant will be just as important as the platform code when checking this.

Yes, all variants of the Mercedes-Benz GLS — petrol, diesel, and hybrid — use disc brakes on all four corners, so this is a genuine part that exists across the entire range. There are no drum-brake variants on this model to be aware of. You simply need to confirm the correct disc size for your specific engine and generation (X166 2016–2019 or X167 2019 onwards) with the breaker.