There are parts on your trailer that you don't think about and might not even know the name of but they're integral to having a safe journey. The 225 Caliper Piston Boot is just such a part. If the caliper boot becomes damaged or ripped, you can end up with water, dirt, road salt, or debris in your caliper piston surface. When this happens, you can experience tearing or seizing of the caliper piston seal, which would cause a loss of brake fluid and pressure, creating a dangerous situation on the road. The Kodiak 225 Caliper Piston Boot is for disc brake assemblies on axles rated from 3,500 to 6,000 lbs. Make sure you're traveling safe and use only the most durable caliper piston boot on your trailer. If you have any questions about what part you may need for your trailer, don't hesitate to contact SkipperMate Marine. We'll do our best to point you in the right direction.