The brake system on your GMC C4500 Topkick is supported and stabilized by the brackets, flanges and hangers. These parts are designed with high performance in mind, as the brakes receive a lot of wear and tear over time. Often crafted from steel and coated to prevent rust, these pieces keep your system in place.
Without a brake system and components that are manufactured from the highest quality materials, your GMC C4500 Topkick is unfit for use on the road. The ability to stop and decelerate as needed is important for driving safely and avoiding accidents. Be sure to replace these parts as soon as they show signs of malfunction.