Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 22 (DISC BRAKES)SYSTEM TESTSBRAKE SYSTEM VACUUM SOURCE TEST
2004 Oldsmobile Bravada AWD
Brake System Vacuum Source Test
2004 Oldsmobile Bravada AWDSECTION Brake System Vacuum Source Test
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix and 2002 Oldsmobile Intrigue. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the engine vacuum hose from the power brake booster check valve.
- Install a vacuum gauge 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. See ENGINE VACUUM RANGE table.
- 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.
- Cracks, cuts, dry-rot.
- 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 power brake booster check valve from the booster.
- Install the check valve to the engine vacuum hose.
- Install the vacuum gauge 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. See ENGINE VACUUM RANGE table.
- 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 power brake booster.
- Deformation or contamination.
- Cracks, cuts, dry-rot.
- If any of these conditions were found with the check valve grommet, replace the grommet.
ENGINE VACUUM RANGE
| Specification | Range In. (kPa) |
|---|---|
| Normal Engine Vacuum | 14-20 (47-68) |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.