1. Remove the clamps and vacuum hose.
2. Apply both suction and pressure to the engine-side hose, and verify that air blows only toward that side.

Air bleeding
Brake pedal inspectionMazda 6 Service Manual: Control valve body installation
On-Vehicle Installation
Caution
Be sure to align the parking rod and the manual valve.
1. Install the accumulator springs and accumulators into the transaxle case.
2. Install the control valve body component.
Tightening torque
7.8-10.8 N·m
{80-110 kgf·cm, 70-95 in·lbf}
Bo ...
Mazda 6 Service Manual: Cruise Control (Some models)
With cruise control, you can set and automatically maintain any speed of more
than about 25 km/h (16 mph).
WARNING
Do not use the cruise control under the following conditions: Using
the cruise control under the following conditions is dangerous and could result
in loss of vehicle control.
...