Thought I might shed some light on the topic of recalls where parts are concerned and not software. The below might not apply to this recall but I suspect it does.
Unless I've missed it, it's not yet clear who makes the components and how large of an outfit they are. This alone can play into how quick they can ramp up replacement parts. Does the Six have different brakes that the Four?
However, in general, new and aftermarket components don't often come off the same assembly line. I once worked for Siemens Automotive where we were making HVAC motors for BMW. We had two lines running. One for motors that were meant for the production line to keep the factory moving and a smaller assembly line for motors that would be used for replacement parts. I worked on both and for the life of me I couldn't make out what was different. To me the parts were the same, assembly, testing etc.
From my work within the VAG, I know the same goes for many of the wheels that are used. One department works with the supplier to place and forecast orders while a totally separate department works for the same supplier to feed the aftersales and warranty side of things.
In short, MMC are likely at the mercy of their supplier and/or the warranty side of MMC trying to get said supplier to ramp up production to meet their need. Contractually both are likely separate so said supplier is trying to fulfil two requirements.,
Hopefully this helps shed some light on what goes on in the background and eases any misgivings about MMC keeping the factory line moving.
