Truck was running fine and I went to back it out over the weekend to head somewhere and it was making a grinding noise from the back driver side tire and was also making while going forward. Checked the rotor and it was in bad shape so I replaced that and put new pads on both sides last night. Test drove it last night and it seemed fine. This morning on my way to work, I heard the noise again for a very short period of time maybe once or twice while slowing down. Any ideas on what this may be coming from? I checked the passenger side rotor and it is getting close to needing replaced and my do it this weekend.