Cadillac 2008 XLR Owner's Manual page 91

When you move out of PARK (P) or NEUTRAL (N)
and the engine is running, the parking brake should
release. If the parking brake has not been fully released
and you try to drive off with the parking brake on, the
parking brake indicator light will come on and stay on.
If the parking brake does not fully release, you can
manually release the pedal.
CAUTION:
{
Always shift to PARK (P) before pulling the
manual release lever. If your hand or arm is in
the way of the pedal you could be hurt. The
pedal springs back quickly. Keep your hand
and arm away when you use the manual
release lever.
Before releasing the manual parking brake, be sure to
put the vehicle in PARK (P) and turn the ignition off.
Reach under the driver's side of the instrument panel and
pull down on the manual release lever, which is located
behind the parking brake pedal. Pull down on the yellow
tab. If the parking brake does not release, you should
have your vehicle towed to your dealer for service.
Notice: Driving with the parking brake on can
overheat the brake system and cause premature
wear or damage to brake system parts. Make sure
that the parking brake is fully released and the
brake warning light is off before driving.
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