Hydraulic systems, one of which your GMC brake caliper is a part of, can perform some pretty amazing feats when they're working correctly. For example, the small chunk of metal that is your GMC brake caliper can haul your three-ton work truck down to a halt in what would have been an unthinkably short distance just ten years ago. Add in the reliability of the GMC brake caliper, considering that it can stop your truck day in and day out for thousands of miles without a hiccup and the whole thing is pretty darn impressive. However, we did say that the GMC brake caliper and its related hydraulics were cool when they were working correctly, and eventually your GMC brake caliper will wear out and fail. You can help slow the process, though: Yearly flushing of your brake fluid will ensure that moisture is kept out of the GMC brake caliper. Not only will fluid flushes prevent internal rust in the GMC brake caliper, but they will also shorten your braking distances and keep fade at bay. Of course, if your truck has 80,000 miles on its original brake fluid, the damage is probably already done. You may have a leaky GMC brake caliper or a GMC brake caliper that's got a piston sticking in its bore. Either situation is going to cause erratic braking operation, so you need to find out which GMC brake caliper is causing the problem and rebuild or replace it immediately. You can rebuild your own GMC brake caliper, but some specialized tools are required. If you don't have a complete machine shop you'd be wise to pick up a new or remanufactured GMC brake caliper from our large selection. You can always be assured that you're getting the best quality GMC brake caliper available, and our prices are unbeatable-we guarantee it. So don't take chances with the brakes on your big work truck: Make sure you maintain your GMC brake caliper and install a replacement GMC brake caliper when the time comes.