5 year old car with brake pipe corrosion. OMG.
At least they needed a clean. Had similar on my 15 year old car. Advisory so I cleaned the pipes externally and applied a thin coat of grease to prevent further corrosion. No advisories since.
That is a serious rip off. Brake pipes are nothing fancy.
At last! A response that isn't basically 'you bought a poncy car - what did you expect?'
First off, as you say, '5 year old car with brake pipe corrosion. OMG.' My Golf is over 20 years old and I've never had so much as a peep about the brake pipes. If a 'premium' car has a problem after five years, shame on BMW.
Second, it didn't. The independent garage confirmed it. Subjective schmubjective, this just reeks of those holiday car-hire firms that hit people with massive, spurious 'damage' penalties.
Third, how in God's name can BMW justify charging '£380-£520 each, plus VAT' for a brake pipe? It's a pipe, fercrisakes, not a hi-tech piece of electronics. That would make it a hundred times more than 'the cost of a new brake pipe - £5'. How come? Is it a, like, really really good pipe?
Fourth, even if it cost that much, how can it be over a grand to supply & fit it? It's a pipe! Which means you have to undo the nut at each end, remove it, put in the replacement and do up the nut at each end. 10 minutes? 20 with topping up the brake fluid and making sure everything's good. How can that cost hundreds of pounds?
It's clearly an outrageous ripoff. I don't know who you can complain to, but to suggest there's anything defensible about it because a Mini is a poncy car is just wrong.