Brake booster check valve — checking, removing and installing (Opel Astra F)

The purpose of the valve is to allow air to flow in only one direction out of the booster. If the valve is leaking air in both directions, it needs to be replaced.

To check the valve, first remove the hose/valve assembly as described later in this section.

Blow through the hose from the booster side: air should pass freely through the valve.

Now blow out the hose from the intake manifold side; air should not pass through.

If the valve is faulty, it must be replaced.

The plastic valve is located in the vacuum hose that runs from the intake manifold to the brake booster.

When replacing a valve, it is easier to replace the entire hose/valve assembly.

To remove the assembly, carefully disconnect the hose adapter from the vacuum booster, then unscrew the booster nipple; after disconnecting the hose fitting from the inner manifold, remove the assembly.

Installation is carried out in the reverse order of removal, but when connecting the hose adapter to the amplifier, try not to damage the gasket. Then start the engine and check for air leaks.