Keeping you Ready for the Road Ahead , the Webb Ultra Grip LH MC225 Trailer Air Disc Brake Caliper improves your semi truck's braking efficiency. Twin return springs with a unique actuation block provides elimination of caliper or lever binding. Constructed to withstand rugged conditions, the robust ductile iron housing, formulated with special enhancements, offers heightened strength and durability. 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 .