It's pads first. When you're done, the fluid should be a max level with full pads. So you'll never have to worry about the brake reservoir on the master cylinder overflowing and ruining that sensor that's right below it.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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