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Symptom Table - NVH
WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
NVH symptoms should be identified using the diagnostic tools that are available. For a list of these tools, an explanation of their uses and a glossary of common terms, refer to GLOSSARY OF TERMS
. Since it is possible any one of multiple systems may be the cause of a symptom, it may be necessary to use a process of elimination type of diagnostic approach to pinpoint the responsible system. If this is not the causal system for the symptom, refer back to NOISE, VIBRATION AND HARSHNESS (NVH)
for the next likely system and continue diagnosis. SYMPTOM TABLE - NVH
| Condition |
Possible Sources |
Action |
- Vibration when the brakes are applied
|
- Brake disc(s)
- Suspension components
|
|
- Brake vibration/shudder - occurs when the brake pedal is released
|
|
|
|
|
- Caliper guide pins or guide pin bolts
|
|
- Missing or damaged anti-rattle clips or springs
|
|
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|
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- Squealing noise - occurs on first (morning) brake application
|
|
- Acceptable condition. Caused by humidity and low brake pad temperature.
|
- Squealing noise - a continuous squeal
|
|
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- Squealing noise - an intermittent squeal
|
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- Acceptable condition. Caused by cold, heat, water, mud or snow.
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- Groaning noise - occurs at low speeds with brake lightly applied (creeping)
|
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- Grinding/moaning noise - continuous
|
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- INSPECT the brake pads/discs and attaching hardware for damage. VERIFY brake components are within specifications. REFER to BRAKE SYSTEM INSPECTION .
|
- Excessive vacuum pump noise (above 60-70 dB)
|
|
- INSTALL new vacuum pump as necessary.
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