If you know you need to replace one of your drum brake cylinders, we hope you're considering doing it yourself. Don't be intimidated by the job. Sure, brakes are super important, but it's also easy to know whether you've done the job right. Proper and thorough testing after a brake repair is essential to your safety. But once you've tested the system, chances are you did the repair correctly and your vehicle is safe. Besides, brake work isn't that hard to do!