Brake Fluid Pressure Sensor Inspection

Turn the ignition switch off.
Disconnect the brake pipe (master cylinder side). (See MASTER CYLINDER REMOVAL/INSTALLATION .)
Install the SSTs to the master cylinder as shown in the illustration.
NOTE:
- When installing the SST (49 D043 0A0) to the master cylinder, use a commercially available flare nut wrench.
Bleed the brake line and the SSTs of air. (Bleed the SSTs of air using air bleed valve A.)

Fig 1: Installing SST To Master Cylinder
Courtesy of MAZDA MOTORS CORP.
Connect the M-MDS to the DLC-2.
Select the "MPRETDR" PID.
Start the engine.
Depress the brake pedal, and verify that the fluid pressure value of the SST (gauge) and the value shown on the M-MDS are equal.
- If the fluid pressure values are different, replace the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION .)
Install the brake pipe. (See MASTER CYLINDER REMOVAL/INSTALLATION .)
After installation, add brake fluid, bleed the air, and inspect for fluid leakage. (See AIR BLEEDING .)

Fig 2: Identifying DLC-2 Connector
Courtesy of MAZDA MOTORS CORP.