Prior to this inspection, check the operation of check valve and check that the vacuum hose (with built-in check valve) is installed in the correct direction.

Disconnect the vacuum hose (with built-in check valve) in the brake electric vacuum pump side, then connect the hand vacuum pump to check that the negative pressure is maintained. When the negative pressure is maintained, the vacuum line is in good condition. If the negative pressure is not maintained, check whether the vacuum hose is connected properly and perform the operation check of brake booster (refer to ).