Verified answer

1) The brakes are tested.

2) The filters are replaced.

3) Air is put in the tyres. (3-я форма неправильного глагола PUT так и будет, без изменений - PUT).

4) The battery is checked.

5) The lights are tested.

6) Broken parts are repaired.

7) It is taken for a test drive.

8) The radiator is filled with water.

Форма Present Simple Passive: am / is / are + past participle (3-я форма неправильного глагола). Правильный глагол - добавляем окончание -ed.