Jeep 2006 Wrangler - Manual (Page 201)

If the parking brake is not completely released, the
BRAKE warning light will remain on.
NOTE: Your vehicle has automatically adjusting rear
brakes and we do not recommend any adjustment other
than the maintenance performed by your authorized
dealer.
Before leaving the vehicle parked on a hill, you must
make sure the parking brake is fully applied and place
the gear selector in the P (Park) position (automatic
transmission) or first gear (manual transmission). Make
certain the transfer case is in gear. Failure to do so may
cause the vehicle to roll and cause damage or injury.
Parking Brake Release
STARTING AND OPERATING 201
5