1. Disengage the door garnish clips using a fastener remover.
2. While cutting the double-sided adhesive tape using a screwdriver or a razor, separate the rear door garnish from the body.
Warning
3. Remove the rear door garnish.

Rear flap removal/installation
Rear door garnish installationMazda 6 Service Manual: Electric Parking Brake
The electric parking brake equipment applies the parking brake using an electric
motor. When the electric parking brake is applied, the electric parking brake switch
indicator light turns on.
WARNING
Do not drive the vehicle with the electric parking brake applied:
If the vehicle is driven ...
Mazda 6 Service Manual: Scheduled Maintenance (U.S.A., Canada, and Puerto Rico)
Follow Schedule 1 if the vehicle is operated mainly where none of the following
conditions (severe driving conditions) apply.
Repeated short-distance driving
Driving in dusty conditions
Driving with extended use of brakes
Driving in areas where salt or other corrosive materials are used
...