GMC 2006 Sierra - Manual (Page 400)

Trailer Brakes
If your trailer weighs more than 2,000 lbs (900 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 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, 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
{ 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 cannot
see or smell CO. It can cause unconsciousness
or death. See Engine Exhaust on page 2-57. 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. Do not use the climate
control setting for maximum air because it
only recirculates the air inside your vehicle.
See Climate Control System on page 3-21.
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