My dad has an 1993 Ford F150, and the front end has been making an scraping sound. We checked behind both tires, and both the castle nuts where tight, and all the wheel bearings have been replaced and are tight too. After we checked wheel bearings, the breaks went out. There are no holes in the break lines, there is break fluid in the master cylinder, new rubbers, and new wheel bearings. Sadly we don't have enough money to get the engine rebuilt.