1995 GMC Safari Owner's Manual - Page 165

Safety Chains You should always attach chains between your vehicle and your trailer. Cross the safety chains under the tongue of the trailer so that the tongue will not drop to the road if it becomes separated from the hitch. Instructions about safety chains may be provided by the hitch manufacturer or by the trailer manufacturer. Follow the manufacturer's recommendation for attaching safety chains and do not attach them to the bumper. Always leave just enough slack so you can turn with your rig. And, never allow safety chains to drag on the ground. Trailer Brakes If your trailer weighs more than 1,000 pounds (450 kg) loaded, then it needs its own brakes - and they must be adequate. Be sureto read and follow the instructions for the trailer brakes so you'll be able to install, adjust and maintain them properly. Your trailer brake sys.tgm r;antap intoyour vehicles's hydraulic brake system, except: Don't tap intoyour vehicle's brake system if the trailer's brake system ~ fluid from your vehicle's will use more than 0.02 cubic inch ( 0 . 3 ~of ) master cylinder. If it does, both braking systems won't work well. You could even lose your brakes. Will the trailer parts take 3,000 psi (20 650 kPa) of pressure? If not, the trailer brake system must not be used with your vehicle. If everything checks out this far, then make the brake fluid tap at the port on the master cylinder that sends fluid tothe rear brakes. But don't use copper tubing for this. If you do, it will bend and finally break off. Use steel brake tubing.