The disc calipers on your trailer are made up of multiple components that work together to keep your brakes running smoothly. Both the calipers and your rotor work simultaneously to slow your trailer down by creating friction between the two parts. This UFP DB-42 Caliper Piston is 48 mm in diameter and a perfect replacement for UFP trailers. When youre cruising down the road, if it doesnt seem like theres an initial response when you apply the brakes, it might be time to check your caliper pistons to ensure they are functioning properly. When you apply your brakes, the pistons force your caliper brake pads to connect with the brake rotor, helping your trailer come to a complete stop. If the piston is worn down then the connection is not as tight, and you may not be able to stop as quickly as you were expecting, particularly in an emergency. Instead of paying for a total caliper brake replacement, you have the option to replace the piston if you are able to diagnose the issue. This UFP piston will upgrade your hardware and, depending on the condition of the caliper brake pads themselves, can extend the longevity of your calipers. If you need additional parts, or want to check on the pricing for a replacement set of caliper brakes, explore our complete inventory online.