I owen a 1998 gmc sierra rear wheel drive with disc brakes on the front and drum on the back and the snow is just starting to melt and there is some pudles on the road.the back brakes are making a noise when i stop not when i apply the brakes only when it comes to a complete stop it not like a screaching noise it more of an earching noise. so i want to know if it could just be the moister causeing this or do i need to do the brakes