Do you know the nature of the previous owner's 'problem', what symptoms he had, with the brakes on your car, Joe? If not, could you ask him? It might give you a clue as to where to start looking.
I agree with you that the problem manifesting itself after changing the wheels is likely to be co-incidental. I'd be very surprised if simply changing your wheels could itself cause a problem with your brakes.
As you know, your car has a triangular split dual system, so even if one circuit went down, you should still have 80% braking effort remaining.
If it is a complete failure, I'd first check my fluid level. If that's OK, possibly air in the system, a fault in the master cylinder affecting both circuits, or a fault with the servo could all contribute to the symptoms that you describe.
There are members with a wealth of specialist knowledge on the 2 series who will be able to offer you more detailed advice, but the general principles are the same for most braking systems. At least it might give you a starting point and enable you to rule certain things out.
Good luck! Regards, John.
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