GMC SIERRA 1997 Manual page 402

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2.
Firmly apply the parking brake (see "Parking Brake"
in the Index if necessary).
Parking Brake and Automatic Transmission
PARK (P) Mechanism Check
NOTE: Be ready to apply the regular brake
immediately if the vehicle begins to move.
3. With the engine off, turn the key
to the
RUN position,
but don't start the engine. Without applying the regular
brake, try to move the shift lever out of
PARK
(P)
with normal effort. If the shift lever moves out of
PARK (P),
your vehicle's
BTSI
needs service.
Ignition Transmission Lock Check
While parked, and with the parking brake set, try
to turn
the ignition key to LOCK in each shift lever position.
With an automatic transmission, the key should turn
to LOCK only when the shift lever is in PARK (P).
With a manual transmission, the key should turn to
LOCK only when the shift lever is in REVERSE (R).
On vehicles with a key release button, try to turn the key
to LOCK without pressing the button. The key should
turn to LOCK only when you press the key button.
On all vehicles, the key should come out only in LOCK.
I
When you are doing this check, your vehicle
could begin to move. You or others could be
injured and property could be damaged. Make
sure there is room in front of your 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 transmission in
NEUTRAL (N), slowly remove foot pressure from
the regular brake pedal. Do this until the vehicle is
held by the parking brake only.
0
To check the PARK (P) mechanism's holding ability:
With the engine running, shift to PARK (P). Then
release all brakes.
7-48

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