Browse Wabco Double Diaphragm Tristop 30/30 Brake Actuators / Chambers on MyLittleSalesman.com and compare listings with prices from $78 to $112. Sellers include Frontier Truck Parts. Filter by condition, price, or year to quickly narrow down to the right Wabco Double Diaphragm Tristop 30/30 Brake Actuator / Chamber.