Legacy Postal Wagon AWD F4-2.2L SOHC (1998)
Vacuum Brake Booster Check Valve: Testing and Inspection
1. Check valve is built into vacuum hose. Disconnect vacuum hose to inspect function of check valve.
Blow air into vacuum hose from its brake booster side end: Air must flow out of engine side end of hose. Next blow air into hose from engine side:
Air should not flow out of hose.
Replace both check valve and vacuum hose if check valve is faulty. Engine side of vacuum hose is indicated by marking "ENGINE" as shown.
2. Check vacuum hose for cracks or other damage.
NOTE: When installing the vacuum hose on the engine and brake booster, do not use soapy water or lubricating oil on their connections.
3. Check vacuum hose to make sure it is tight and secure.
