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ISTA is the gold standard in diagnostic tools. You need a laptop for it and the learning curve can be steep. But yes, you can do brakes without it, although it's handy to have at least Bimmercode (downloaded to your phone and a OBDII dongle) that allows you to retract the electronic emergency brake without doing it manually. But manually is not all that difficult either. But otherwise, doing brakes on a $130,000 car isn't really any different than doing brakes on a $30,000 car.
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