Checking the vacuum pump (with diesel engines) (Peugeot 406)

The performance of the vacuum pump of the brake system can be checked using a vacuum gauge.

1. Disconnect the vacuum pipe from the pump and connect a vacuum gauge instead.

2. Run the engine to idle.

3. Measure the vacuum created by the pump. After 1 minute of engine operation, the vacuum should be about 500 mm. Hg If the vacuum generated by the pump does not meet the required data, replace the entire pump, as Spare parts for the pump are not supplied.