Order of execution
1. Remove the vacuum hose.
Attention! The one-way valve is pressed into the vacuum hose in a certain position.
2. Use a vacuum pump to check the function of the one-way valve.
Vacuum pump connection | Criteria |
From the vacuum brake booster (A) | Vacuum is created and held |
From the intake manifold (IN) | Vacuum is not created |
Warning! If the one-way valve is defective, replace it along with the vacuum hose.