Between vacuum pump and power brake unit

1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
2. Remove the following parts:
   1. Plug hole plate (See PLUG HOLE PLATE REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
   2. Windshield wiper arm and blade (See WINDSHIELD WIPER ARM AND BLADE REMOVAL/INSTALLATION .)
   3. Cowl grille (See COWL GRILLE REMOVAL/INSTALLATION .)
   4. Windshield wiper motor and link (See WINDSHIELD WIPER MOTOR AND LINK REMOVAL/INSTALLATION .)
   5. Keyless beeper (With advanced keyless entry system) (See KEYLESS BEEPER REMOVAL/INSTALLATION .)
   6. Cowl panel (See COWL PANEL REMOVAL/INSTALLATION .)
   7. Vacuum hose (between vacuum pump and power brake unit) (See VACUUM HOSE REMOVAL/INSTALLATION .)
3. Blow air into the vacuum hose (between vacuum pump and power brake unit) using your mouth from the power brake unit side and verify that the air flows to the vacuum pump side, then blow air from the vacuum pump side and verify that the air does not flow to the power brake unit side.

Fig 1: Checking Air Flow

Courtesy of MAZDA MOTORS CORP.

• If there is any malfunction in the check valve (between vacuum pump and power brake unit), replace it with the vacuum hose (between vacuum pump and power brake unit) as a single unit. (See VACUUM HOSE REMOVAL/INSTALLATION .)