Checking The Line Pressure
Remove the quick-release connector on the vacuum pump. Install: see 9997108 between the quick-release connector and the pump.
Connect: see 9995230 on: see 9997108 .
Install the connector for the pump. Read off the value on: see 9995230 .
The value must be 60 kPa negative pressure when the pump stops.
Press down the brake pedal a couple of times to start the pump. The value when the pump starts must be 45 kPa negative pressure.
If the pump starts at a negative pressure of 0 - 45 kPa or stops at a negative pressure higher than 60 kPa , replace the control valve. See: BRAKE BOOSTER VACUUM HOSE
If the correct system pressure is not obtained even though the pump capacity is correct, this indicates that there is a leak in the system.