Symptom Chart: NVH

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to: Diagnostic Methods .

Condition	Possible Sources	Actions
Vibration when the brakes are applied	Brake disc(s)/ Suspension components	GO to Pinpoint Test A
Brake vibration/shudder - occurs when the brake pedal is released	Brake drag	REFER to Symptom Chart: Brake System
Rattling noise	Caliper guide pins or guide pin bolts Missing or damaged anti-rattle clips or springs Loose brake disc shield	INSPECT the caliper guide pins and guide pin bolts. Refer to: Brake System Inspection . Install new components as necessary. INSPECT the brake pads for missing clips or broken springs. Refer to: Brake System Inspection . Install new components as necessary. TIGHTEN the brake disc shield bolts to specification. Refer to: Brake System Pressure Bleeding . Refer to: Brake Disc Shield .
Squealing noise - occurs on first (morning) brake application	Brake pads	Acceptable condition. Caused by humidity and low brake pad temperature.
Squealing noise - a continuous squeal	Brake pads	INSPECT the brake pads. INSTALL new components as necessary. Refer to: Front Brake Pads . Refer to: Rear Brake Pads .
Squealing noise - an intermittent squeal	Brake pads	Acceptable condition. Caused by cold, heat, water, mud or snow.
Groaning noise - occurs at low speeds with brake lightly applied (creeping)	Brake pads	Acceptable condition.
Grinding/moaning noise - continuous	Brake pads Brake disc	INSPECT the brake pads, brake discs and attaching hardware for damage. VERIFY brake components are within specifications. Refer to: Brake System Inspection . INSTALL new components as necessary.
Excessive brake vacuum pump noise (above 70 dB)	Brake vacuum pump bracket isolators Brake vacuum pump	Verify the noise is from the brake vacuum pump. INSPECT the vacuum pump and vacuum pump bracket isolators. INSTALL new vacuum pump isolators or vacuum pump as necessary.