GMC 2012 Savana Owner's Manual page 284

Be ready to apply the regular
brake immediately if the vehicle
begins to move.
3. With the engine off, turn the
ignition on, but do not start the
engine. Without applying the
regular brake, try to move the
shift lever out of P (Park) with
normal effort. If the shift lever
moves out of P (Park), contact
your dealer for service.
While parked, and with the parking
brake set, try to turn the ignition to
LOCK/OFF in each shift lever
position.
The ignition should turn to
LOCK/OFF only when the shift
lever is in P (Park).
The ignition key should come
out only in LOCK/OFF.
Contact your dealer if service is
required.
When you are doing this check,
the vehicle could begin to move.
You or others could be injured
and property could be damaged.
Make sure there is room in front
of the vehicle in case it begins to
roll. Be ready to apply the regular
brake at once should the vehicle
begin to move.
Park on a fairly steep hill, with the
vehicle facing downhill. Keeping
your foot on the regular brake, set
the parking brake.
To check the parking brake's
holding ability: With the engine
running and the transmission in
N (Neutral), slowly remove foot
pressure from the regular brake
pedal. Do this until the vehicle is
held by the parking brake only.
To check the P (Park)
mechanism's holding ability:
With the engine running, shift
to P (Park). Then release the
parking brake followed by the
regular brake.
Contact your dealer if service is
required.
Windshield wiper blades should be
inspected for wear and cracking.
See
for more information.
Replacement blades come in
different types and are removed
in different ways. For proper type
and length, see
.