I'm assuming you are rooted because you can't delete files on the system partition without being rooted. As a general piece of advice, be very careful when deleting files on the system partition. Make sure you know exactly what it is you are deleting.
I once deleted an innocuous looking file from the system partition and threw my device into a boot loop and soft-bricked it. So I just want to reiterate that it's dangerous deleting anything from the system partition.