Smoky main gear?

[Nigel C]

Different brake compound perhaps?

[NickN]

Perhaps even a completely different brake system design?

[Krzysztof M]

Thanks Brenden and AJ. Amazing how once explained things suddenly make sens.

[Raymond Rowe]

Alot of airbus brakes are carbon fibre. shocking things to go near when not working with gloves.

[Brenden S]

Carbon vs Steel brakes, however Boeing have carbon brakes, all depends on the operator and also the type of brake installed on the aircraft. Airbus are notorious for carbon dust.