Warning. Do not remove the one-way vacuum valve from the vacuum hose.
2. Check the operation of the one-way vacuum valve with a vacuum pump (Rome. 15.12). The valve is healthy if when the pump is connected to the side of the valve going to the vacuum force of the brake gel, a vacuum is created and maintained, and when the pump is connected to the side of the valve going to the intake manifold, no vacuum is created.
Pic. 15.12. Using a vacuum pump to test a one-way vacuum valve
Warning. If the one-way vacuum valve is defective, replace it along with the vacuum hose.