If the vehicle's brake fluid change is not overdue, you would be very unlucky to damage an ABS system, even though the fluid is pushed backwards up the system during a pad change if you don't open the bleed nipple.
What I used to find more incredible was the idea of flipping the seals in the master cylinder - until I saw one happen (~1990). The mechanic a couple of ramps away from me had done a pad change, but couldn't get a firm pedal. I helped him find the fault, and eventually, we had replaced the brake pipes coming out of the master cylinder with bleed nipples, and when we found the brake pedal was still poor, that only left the master cylinder itself. I didn't give it a lot of thought at the time, but, that must have been a difficult conversation with the customer for the staff on the front desk.
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