The flexible hoses connecting the steel brake lines with the front and rear brake assemblies should be inspected for cracks, chafing, leaks, blisters and other damage about every six months. These hoses are important and vulnerable parts of the brake system; therefore, a thorough inspection is required. This check can be aided by a light and mirror. In case of any of the above conditions, you need to replace it. To replace the brake hoses, first loosen the wheel lug nuts then raise your vehicle securely on jackstands. Remove the wheel then unscrew the brake line fitting from the hose at the bracket. If it is a front hose, take away U-clip from threaded fitting on brake line as well. Use a flare-nut wrench to ensure you do not round off its corners. Take out banjo bolt at caliper end; slide hose through bracket if necessary. Additionally if it's a front hose, remove U-clip from strut bracket and disconnect hose itself. Attach caliper with banjo bolt into strut or pass caliper fitting end through strut bracket (for front hose) before installing new hose there using new sealing washers. It's important to make sure that there is no twist between caliper and strut bracket (or chassis for rear brake hoses). Finally route this into frame bracket ensuring it isn't twisted and attach brake line fitting securely. Remember to bleed caliper; then fit wheel back in place lower vehicle and tighten lug nuts to specific torque requirement given in service manual or car maker handbook for example 80 lb ft When replacing metal brake lines do not use copper tubing please have all correct parts prefabricated ones with flared tube ends and fittings are available for purchase Make sure when routing new line through brackets that it is secure and has enough clearance from moving or hot components After installation add fluid if needed check master cylinder fluid level bleed entire system carefully test brakes under controlled condition before driving in heavy traffic.