1996 Chevrolet Astro Owner's Manual - Page 167
1996 Chevrolet Astro Manual
Page 167 highlights
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, thenit needs its own brakes and they must be adequate.Be sure toread and follow the instructions for thetrailer brakes so you'll be able to install, adjustand maintain them properly. Your trailer brake system can tap intoyour vehicles's hydraulic brake system, except: Don't tap into your vehicle's brake system if the trailer's brake system ~ will use more than 0.02 cubic inch ( 0 . 3 ~ of )fluid from your vehicle's 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 (20 650 kPa) of pressure? If not, the psi trailer brakesystem 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 fluidto the rear brakes.But don't If use copper tubing for this. you do, it will bend and finally break off. Use steel brake tubing. 4-29