Cadillac 2011 CTS Coupe Owner's Manual page 355

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).
With the key access ignition
system, the ignition key should
come out only in LOCK/OFF.
See
.
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.
or
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.