Chevrolet 2007 TrailBlazer Owner's Manua page 376

Trailer Brakes
If your trailer weighs more than 1,500 lbs (680 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's brake system can tap into the
vehicle's hydraulic brake system only if:
•
The trailer parts can withstand 3,000 psi
(20 650 kPa) of pressure.
•
The trailer's brake system will use less than
0.02 cubic inch (0.3 cc) of fluid from your
vehicle's master cylinder. Otherwise,
both braking systems won't work well. You
could even lose your brakes.
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.
376
Driving with a Trailer
CAUTION:
{
If you have a rear-most window open and
you pull a trailer with your vehicle, carbon
monoxide (CO) could come into your
vehicle. You can not see or smell CO. It
can cause unconsciousness or death. See
Engine Exhaust on page 130. To maximize
your safety when towing a trailer:
•
Have your exhaust system inspected
for leaks and make necessary repairs
before starting on your trip.
•
Keep the rear-most windows closed.
•
If exhaust does come into your vehicle
through a window in the rear or another
opening, drive with your front, main
heating or cooling system on and with
the fan on any speed. This will bring
fresh, outside air into your vehicle.
CAUTION: (Continued)