1995 GMC Jimmy Owner's Manual - Page 197

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 1,000pounds (450 kg) loaded, then it needs its own brakes - and they must be adequate. Be sure to read and follow the instructions for the trailer brakes so you'll be able to install, adjust and maintain them properly. Your trailer brakes system can tap into vehicle's hydraulic brake system except: Don't tap into your vehicle's brake system if the trailer's brake system will ~ fluid from your vehicle's master use more than 0.02 cubic inch ( 0 . 3 ~of ) 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 Wa) 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 to the rear brakes. But don't use copper tubing for this. If you do, it will bend and finally break off. Use steel brake tubing. 4-43