Replacing bolt and nut I want to change my bolt because it is rusty.  I am concerned that something bad will happen if I remove the bolt completely.

Can someone please tell me if it is okay to remove this bolt completely?

There are three bolts in the picture and all are rusty.

Your quick answer would be helpful to me.
From the picture that seems to be the brake lever clamp. The bolt can be removed, cleaned or replaced and reinstalled with no problems.

Make sure to note the position of the lever in case it moves or falls off when the bolt is removed. You can then position it properly when you re-install the bolt.