GMC 2003 Savana Van Owner's Manual page 239

Trailer Brakes
If your trailer weighs more than 1,000 Ibs (450 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 your vehicle's
hydraulic brake system, except:
rn
rn
0
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
cc) 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 psi (20 650 kPa) of
pressure? If not, the trailer brake system 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 fluid to the rear brakes. But don't use
copper tubing for this. If you do, it will bend and
finally break off. Use double-walled steel tubing.
Driving with a Trailer
If you have a rear-most windot.. Jpen anc
,DU
pull a trailer with your vehicle, carbon
monoxide (CO) could come into your vehicle.
You can't see or smell CO. It can cause
unconsciousness or death. See "Engine
Exhaust" in the Index. To maximize your safety
when towing a trailer:
0
Have your exhaust system inspected for
leaks, and make necessary repairs before
starting on your trip.
0
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 Controls" in the
Index.
4-42