xCharlitos

My rear brakes were noise free yesterday, but that same night it rained. So next day I drove to the store and noticed that the brakes were squealing when I applied the brakes. Do you guys know how to fix this?? I tried braking hard but it didn't work. I hoping that the brake fluid would lubricate the pads.

Also I have a question regarding the Service Light (two wrenches) when I first started to drive it it showed me a 300 and it keeps staying that number. I have drived about 40 miles since the first time. Does the number decrease every 100 miles??