Mack CV/GU Brake Chambers & Accessories Keep your Mack CV/GU truck stopping strong with our selection of brake chambers and accessories. From service and spring brake chambers to combo options, we've got the right fit for your rig. Plus, check out our slack adjusters, brake hoses, and air fittings to keep your braking system running safely and smoothly. Whether you're replacing worn parts or upgrading for better performance, this product lineup has reliable, high-quality options to keep you on the road.