Mercedes-Benz A-Class Brake Discs: Specs, Fitment & Wear Symptoms

A genuinely distinctive finding: a persistent vibration under braking, unresolved by replacing discs, was ultimately traced to a stuck caliper piston, not the disc itself — a G-clamp couldn't even push it back in.

Illustration for editorial purposes

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OEM Part Number: confirm via VIN — front discs (aftermarket) Brembo 09.B343.41 / Bosch 0 986 479 A00

Accuracy note: Covers the Mercedes-Benz A-Class (W176 2012-2018) 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)	Bosch 0 986 479 A00 (280 x 25 mm, vented, 5 holes, coated, high-carbon, minimum 22.4 mm); Brembo 09.B343.41 (280 x 25 mm, vented, 5 holes, coated, high-carbon, minimum 22.4 mm); ATE 24.0125-0200.1 (280 x 25 mm, vented, 5 holes, coated, high-carbon, minimum 22.4 mm); Bosch 0 986 479 A01 (295 x 28 mm, vented, 5 holes, coated, high-carbon, minimum 25.4 mm); Brembo 09.B344.41 (295 x 28 mm, vented, 5 holes, coated, high-carbon, minimum 25.4 mm); ATE 24.0128-0276.1 (295 x 28 mm, vented, 5 holes, coated, high-carbon, minimum 25.4 mm); TRW DF6262S (295 x 28 mm, vented, drilled, 5 holes, painted, minimum 26 mm); Brembo 09.B807.51 (320 x 30 mm, vented, drilled, 5 holes, coated, high-carbon, minimum 28 mm)
Disc sizes & variants	Four front sizes. 280 x 25 mm vented is the base disc on the A160, A180 and A180 CDI; 295 x 28 mm vented (plain or drilled) is the common size for A200, A220 CDI and A250 with the standard brake; 320 x 30 mm drilled covers the A250 Sport and AMG Line sports brake; 350 x 32 mm drilled is the A45 AMG. The 276 mm, 295 mm and 330 mm discs listed for the rear are rears.
Genuine (OE) numbers quoted	None quoted in catalogue listings — order genuine discs against your VIN
Fitment notes	Measure the fitted disc because 280 mm and 295 mm fronts overlap by engine; minimum thickness is 22.4 mm (280), 25.4 mm (295 plain), 26 mm (295 drilled), 28 mm (320) and 30 mm (350). Five-stud, 112 mm bolt circle, 67 mm centre bore.

Mercedes-Benz A-Class Brake Discs: The Part That Pads Depend On

On the Mercedes-Benz A-Class, wear on one of this pair accelerates wear on the other, so a pad change booked as routine maintenance often turns up discs that have quietly deteriorated alongside them.

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.

Mercedes-Benz A-Class Brake Discs: Watch: Replacing It

🎬 Watch: Mercedes A class AMG 2016 front brake discs and pads removal and replacement

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2016 car, so W176; AMG-model brakes but the procedure is similar.

Mercedes-Benz A-Class Brake Discs reference plate

Mercedes-Benz A-Class 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 A-Class typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.

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A Genuinely Distinctive, Honest Finding Worth Knowing — Mercedes-Benz A-Class Brake Discs

If a persistent vibration under braking hasn't been resolved by replacing discs, this is genuinely worth knowing: one documented case saw exactly this kind of vibration ultimately traced to a stuck caliper piston rather than the disc itself, with the piston seized solid enough that a G-clamp couldn't push it back in during a routine pad change. Replacing just the caliper resolved the issue entirely, worth knowing that corrosion on caliper pistons has also been noted as a related cause on a similar car, with the problem expected to genuinely return once new pads wear down and push the piston further out, worth having the caliper pistons specifically checked for free movement if a vibration persists despite fresh discs and pads.

A genuinely distinctive, honest finding 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.

It's also genuinely worth knowing a useful, cost-free fix worth trying first: braking firmly from around 60mph five or six times in succession generates enough heat to deglaze the disc and pad contact faces, often curing a vibration caused by corrosion or uneven pad transfer without needing to replace any parts.

Mercedes-Benz A-Class 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.