Hi, recently i've been hearing a metal on metal scratching noise coming from the front of the car when driving. It seems worse when i turn sharply left but goes away if i even lightly tip the breaks. Also had to break quite hard while coming to a stop going down a slope and there was an extremely loud grinding noise and bit of vibration. The grinding continued for a short while afterwards when i had to break but lessened. It this coming from worn brakes or bearings or something else? I dont have any break warning lights but i dont trust my warning lights seeing as i discovered lately that the engine was nearly bone dry of oil but there was no warning light for that either!