Hi.
In short, no you did not ruin the brakes. Just set them again and see if they hold. However, you are not going to do damage by just moving this amount. I would be more concerned that if it were set and the vehicle moved with no accelerator input. They are probably not adjusted properly or you did not have them fully engaged.
When they are engaged and properly adjusted they should hold the weight of the vehicle in place.
Please let me know if you have more questions but maybe get them adjusted the next time you have it in for service if they don't hold the vehicle in place.
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Saturday, July 6th, 2019 AT 2:27 PM