Symptom Chart - NVH

2010 Ford Focus S, StandardSECTION Symptom Chart - NVH

Symptom Chart - NVH 

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 NOISE, VIBRATION AND HARSHNESS . 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 for the next likely system and continue diagnosis.
SYMPTOM CHART - NVH

Condition Possible Sources Action
  • Vibration when the brakes are applied
  • Brake disc (s)/drum(s)
  • Suspension components
  • Brake vibration/shudder - occurs when the brake pedal is released
  • Brake drag
  • Rattling noise
  • Caliper guide pins or guide pin bolts
  • Missing or damaged anti-rattle clips or springs
  • CHECK the brake pads for missing clips or broken springs. INSTALL new components as necessary. REFER to FRONT DISC BRAKE .
  • Missing or damaged brake shoe hardware
  • CHECK the brake shoes for missing or broken hardware. INSTALL new components as necessary. REFER to DRUM BRAKE .
  • Loose brake disc shield
  • TIGHTEN the brake disc shield bolts to specification. REFER to FRONT DISC BRAKE .
  • Squealing noise - occurs on first (morning) brake application
  • Brake pads/shoes
  • Acceptable condition. Caused by humidity and low brake pad temperature.
  • Squealing noise - a continuous squeal
  • Brake pads/shoes
  • Squealing noise - an intermittent squeal
  • Brake pads/shoes
  • Acceptable condition. Caused by cold, heat, water, mud or snow.
  • Groaning noise - occurs at low speeds with brake lightly applied (creeping)
  • Brake pads/shoes
  • Acceptable condition.
  • Grinding/moaning noise - continuous
  • Brake pads/shoes
  • Brake disc/drums
  • INSPECT the brake pads/drums, brake discs/drums and attaching hardware for damage. VERIFY brake components are within specifications. REFER to BRAKE SYSTEM INSPECTION .
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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.