- 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
47-68 kPa (14-20 in Hg)
- Turn the ignition OFF.
- If the engine vacuum reading is within the specified normal range, proceed
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
47-68 kPa (14-20 in Hg)
- If the engine vacuum reading is maintained within the specified normal
range, proceed 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.
