GMC 2003 C4C042, Owner'S Manual, Page: 89 / 386

2-14
New Vehicle “Break
-
In”
NOTICE:
Your vehicle doesn’t need an elaborate
“break
-
in.” But it will perform better in the long
run if you follow these guidelines:
D Let your engine warm up before you
operate your vehicle under load.
D Keep your speed at 55 mph (88 km/h) or
less for the first 500 miles (805 km).
D Don’t drive at any one speed
--
fast or
slow
--
for the first 500 miles (805 km).
Don’t make full
-
throttle starts.
NOTICE: (Continued)
NOTICE: (Continued)
D Avoid making hard stops for the first
200 miles (322 km) or so. During this time
your new brake linings aren’t yet broken
in. Hard stops with new linings can mean
premature wear and earlier replacement.
Follow this breaking
-
in guideline every
time you get new brake linings.
D Use the lowest gear you can when you start
a loaded vehicle in motion and when going
up hills to avoid overloading the engine.
D Check and adjust engine and transmission
fluid levels often and be sure tires are
properly inflated for the load you’re
carrying.
D If you have a Caterpillar
R
diesel engine, see
the Caterpillar
R
Diesel Engine Operation
& Maintenance Manual.