Service Brake Booster; Service Stability - GMC Yukon Denali 2003 Owner's Manual

SERVICE BRAKE BOOSTER

If your vehicle has vacuum assist power brakes, this
message will be displayed on the DIC when there is a
problem with the Supplemental Brake Assist system.
If the message is displayed immediately after starting
the vehicle or the message appears while driving,
your Supplemental Brake Assist system needs service.
See Brake System Warning Light on page 3-35 .
{
CAUTION:
Your brake system may not be working
properly if the SERVICE BRAKE BOOSTER
message is displayed.
If the brake system warning light is also on, you
should have the vehicle towed for service. See
"Brake System Warning Light" in the Index.
CAUTION: (Continued)
CAUTION: (Continued)
If the brake system warning light isn't on, you
still have brakes, but the supplemental brake
assist system may not operate properly. In the
event of a vacuum loss, you may not have
vacuum power assist for braking. The brake
pedal will be harder to push and it will take
longer to stop. If you continue to drive with
this message displayed it can lead to a crash.
Have the brake system serviced as soon as
possible.

SERVICE STABILITY

If you ever see the SERVICE STABILITY message, it
means there may be a problem with your
®
Stabilitrak system. If you see this message try to reset
the system (stop; turn off the engine; then start the
engine again). If the SERVICE STABILITY message still
comes on, it means there is a problem. You should
see your dealer for service. The vehicle is safe to drive,
however, you do not have the benefit of Stabilitrak
so reduce your speed and drive accordingly.
®
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3-61