The only way to check it is to road test it. Think about it. If you have paperwork or a number on the unit that said it had X stall and X Flash stall would that mean that’s what it is? Or will it be whatever it is after testing? Your best bet is to take it out and test the brake stall and then flash stall then you’ll know exactly. The search function here or do a a DuckDuckGo search On how to test for both