I have a 1984 C-10 Chevy truck 2wd. When I press on the break pedal, it almost goes to the floor before the truck feels like its gonna stop. A couple weeks before the brakes squealed a little bit when Id stop but not now. What is the problem? Does my truck have drum brakes on front and back or disc and drum? Somebody please help me, I need to get it fixed in hurry!