Hi,
This happens when the brake booster push rod is adjusted out too far which does no allow the brake master to return fully holding the brakes on . To confirm the issue loosen the brake master mounting bolts 3 turns to see if the car starts to roll again, if so remove the master and adjust the booster push rod inward. Also a brake flex hose can come apart internally causing a short of check valve in the system but this is usually isolated to one brake either front or rear.
Check out the link below.
https://www.2carpros.com/articles/brake-caliper-replacement
Give it a check and let us know what was done to resolve the problem or if you require further assistance.
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Thursday, March 18th, 2021 AT 9:22 AM