1996 Chevrolet Suburban Owner's Manual - Page 226

Trailer Brakes If your trailer weighs more than 1,000 pounds (450 kg) loaded, then it needs - and they must be adequate. Be sure to read and follow the its own brakes so you'll be able toinstall, adjust and instructions for the trailer brakes maintain themproperly. Your trailer brakesystem can tap intoyour vehicle's hydraulic brake system, but consider the following: 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. 0 Will the trailer brakeparts take 3,000 psi (20 650 kPa) of pressure? If not, the trailerbrake system must not be used with your vehicle. If everything checks out this far, make the brake tap at the port on the master cylinder that sends the 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. Driving with a Trailer 4-43