Shop for Aftermarket Brake Chambers & Accessories Designed to Fit the Sterling Acterra Truck Model. Our product lineup includes everything from brake chambers and slack adjusters to hoses, valves, and various fittings made from durable materials. Most parts offer fairly easy, DIY-installation. So, whether you're a fleet manager, mechanic, or owner-operator, investing in high-quality brake chamber parts will help you maintain the value of your Sterling Acterra truck for years to come.