Mazda CX-9 Grand Touring 2009 Manual page 520

BRAKE PEDAL REMOVAL/INSTALLATION
CAUTION:
1. Remove in the order indicated in the table.
2. Install in the reverse order of removal.
2008 Mazda CX-9 Grand Touring
2008 BRAKES Conventional Brake System - Mazda CX-9
The clearance between the brake switch and the brake pedal is
automatically adjusted to the correct amount when the brake switch
is inserted into the installation hole on the brake pedal and rotated to
fix in place. If the brake switch is not properly installed, the clearance
may be incorrect, causing a brake light malfunction. Therefore,
always verify that the brake pedal is properly installed and fully
released before installing the brake switch to the pedal.
Once the brake switch clearance has automatically been adjusted, it
cannot be adjusted again. Therefore, replace the switch with a new
one when replacing the power brake unit or the pedal, or performing
any procedure that changes the pedal stroke.