1997 Oldsmobile Bravada Owner's Manual - Page 180

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 manufxturer's recommendation for attaching safety chains and do not attach them to the bumper. Always leave just enough slack so you can turn with y o t ~ l rig. . And, never allow safety chains to drag on the ground. Your trailer's brake system can tap into the vehicle's hydraulic brake system only if: 0 The trailer parts can withstand 3,000 psi (20 650kPa) of pressure. The trailer's brake system will use less than 0.02 cubic inch (0.3 cc) of tluid from your vehicle's master cylinder. Otherwise, both braking systems won't work well. You could even lose your brakes. 0 Trailer Brakes If your trailer weighs more than 1,000 Ibs. (450 kg) loaded, then it needs its own brakes -- and they I I N I S ~be adequate. Be sure to read and follow the instructions for the trailer brakes so you'll be able to install, acl.jtlst and maintain them properly. 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. 4-48