Its hard to explain but if i brake hard abrubtly, ill get this grinding/ rubbing kinda scary sound from the brakes as if they're locking up?? When i brake normal, everything is fine, no issues, its literally ONLY when i brake hard all of a sudden

 

You have 4 wheel anti lock brakes ?

 

I dont know bc i do have the ABS light on dash when i start the car but i dont have the abs connector in the front hub, i have the rear abs i think

 

You'll have wires running to the front hub bearing assemblies if you have 4 wheel anti lock.

 

Have you checked your pads, and are the rotors smooth or do they have lines in them

 

The slide pins may also be seized.

 

Sounds like anti-lock brakes to me.