Purchased in March 2019 and advertised as a truck and tow brake. I usually empty my truck, but 3 or 4 times a year I load a camper on the truck and pull a PWC behind it. I don't brake hard and watch my gear. The truck started pulling the other day and smelled like hot brakes. Rear right disassembled, and the piston torn to pieces! Checked the broken parts of the piston and found that they are light, checked with a magnet and they are not metal but high temperature plastic! Looks like the plastic got hot and crashed! Do yourself a favor and check the metal pistons in any calipers you buy.