Vacuum Vent Valve: Testing and Inspection

Vacuum Dump Valve Adjustment.:

1. Disconnect vacuum hose from the servo that leads to the dump valve.
2. Connect a hand vacuum pump to the hose, and draw vacuum. If a vacuum can not be obtained, the hose or dump valve is leaking, and should be replaced.
3. Step on brake pedal. The vacuum should be released. If not adjust or replace the dump valve, Fig. 11.