The Webb Ultra Grip RH MC225 Trailer Air Disc Brake Caliper ensures you are Ready for the Road Ahead , improving your semi truck's braking efficiency. Twin return springs with a unique actuation block ensures elimination of caliper or lever binding. Built tough, the durable ductile iron housing with special formulation proves increased strength and durability under the toughest conditions. Failure to replace calipers when needed can lead to increased downtime and cost. Gain the adequate handling of stopping power, backed with the confidence you need for your braking system. FleetPride is your First Click in Heavy Duty .