- Disconnect the engine vacuum hose from the vacuum brake booster
check valve.
- Install a vacuum gage to the engine vacuum hose.
- Start the engine and allow the engine to idle until normal operating
temperatures are reached.
- Check to see if the engine vacuum reading is within the specified
normal engine vacuum range.
Specification
The engine vacuum range is 33.86-60.95 kPa (10-18 in Hg).
- Turn the ignition OFF.
- If the engine vacuum reading is within the specified normal range,
go to step 10.
- If the engine vacuum reading is NOT within the specified normal
range, inspect the engine vacuum hose for the following conditions.
| • | Tight connection to the engine |
| • | Collapse, deformation or contamination |
- If any of these conditions were found with the engine vacuum hose,
replace the hose, then repeat steps 2-4.
- If none of these conditions were found with the engine vacuum
hose, then there is an engine vacuum source problem, check the engine vacuum
system.
- Remove the vacuum brake booster check valve from the booster.
- Install the check valve to the engine vacuum hose.
- Install the vacuum gage to the check valve.
- Start the engine and allow the engine to idle until normal operating
temperatures are reached.
- Turn the ignition OFF.
- Check to see if the engine vacuum reading is maintained within
the specified normal engine vacuum range.
Specification
The engine vacuum range is 33.86-60.95 kPa (10-18 in Hg).
- If the engine vacuum reading is maintained within the specified
normal range, go to step 18.
- If the engine vacuum reading is NOT maintained within the specified
normal range, replace the brake booster check valve, then repeat steps 11-15.
- Inspect the brake booster check valve grommet for the following
conditions.
| • | Firm connection to the vacuum brake booster |
| • | Deformation or contamination |
- If any of these conditions were found with the check valve grommet,
replace the grommet.
