It is recommended to check the rubber brake hoses that connect the steel brake lines to the front and rear brake assemblies approximately every six months after securely lifting the vehicle on jackstands. Check hoses for any signs of damage such as cracks, chafing, leaks, blisters, or other issues that might jeopardize their integrity. A thorough inspection should be done using a light and mirror for a complete assessment, and replace hose if any of these conditions are found. When replacing flexible brake hoses, whether they are front or rear, the process is generally the same. First loosen wheel lug nuts; then lift and secure vehicle on jackstands ; then remove wheel. Unscrew brake line fitting from hose at frame bracket that holds it (if necessary supporting frame bracket). Also remove break hose bracket from steering knuckle. Remove U-clip from female fitting at bracket, then pass hose through bracket. At caliper end of hose, remove inlet fitting bolt and take off from caliper discarding sealing washers. Connect fitting to caliper with inlet fitting bolt and new sealing washers tightened to specified torque. Route hose into frame bracket without twisting it and reconnect brake line fitting securely. Bleed caliper if necessary; install wheel and lug nuts; lower vehicle; tighten lug nuts to specified torque. For rear hoses raise rear of vehicle; support it securely on jackstands and block front wheels. Unscrew brake line fitting from hose at appropriate bracket location (s); remove U-clip to pass hose through bracket. If working on a Titan unscrew hose from caliper; if working on an Armada unscrew inlet fitting bolt and detach fitting from caliper discarding sealing washers.Titan models may have two hoses connecting the rear axle housing to the chassis, so unscrew the brake line fittings and remove the bolt securing the hose to the bracket on axle housing.Reinstallation follows reverse procedure use new sealing washers for hose fittings and bleed both rear brakes if necessary. When replacing brake lines, make sure to use the right steel brake lines and avoid copper tubing for brake system components. There are prefabricated brake lines with flared tube ends and fittings that need to be bent into the right shapes using a tubing bender. Check correct support and clearance for the new line after installation, examine master cylinder fluid level and add fluid as needed, bleed the break system, thoroughly test your breaks before getting out into traffic.