Symptom Chart - Brake Noise/Vibration

WARNING: This page is about a different car, the 2003 Mercury Sable and 2003 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHARTS

Condition	Possible Sources	Action
Rattling noise	Caliper mounting bolts loose.	CHECK the caliper bolts. TIGHTEN to specifications. REFER to DISC & DRUM disc brakes.
Damaged or worn caliper pins or retainers.		CHECK the caliper pins and retainers for lubrication and correct fit. LUBRICATE or INSTALL new components as necessary. REFER to 206-04 disc brakes.
Missing or damaged anti-rattle clips or springs. Loose brake disc shield.		CHECK the brake pads for missing clips or broken springs. INSTALL new components as necessary. REFER to DISC & DRUM for disc brakes. TIGHTEN the brake disc shield bolts to specification. REFER to DISC & DRUM .
Clicking noise - with brakes applied with ABS brakes	ABS hydraulic control unit.	Acceptable condition.
Squealing noise - occurs on first (morning) brake application	Disc brake pads.	Acceptable condition. Caused by humidity and low disc brake pad temperature.
Squealing noise - a continuous squeal	Disc brake pads or linings worn below minimum thickness.	INSTALL new disc brake pads. REFER to DISC & DRUM disc brakes.
Squealing noise - an intermittent squeal brought on by cold, heat, water, mud or snow	Disc brake pad.	Acceptable condition.
Groaning noise - occurs at low speeds with brake lightly applied (creeping)	Disc brake pads.	Acceptable condition.
Grinding noise - continuous	Disc brake pads or linings worn below minimum thickness.	INSPECT the disc brake pads, brake discs/drums and attaching hardware for damage. REPAIR or INSTALL new components as necessary. REFER to DISC & DRUM for drum brakes.
Moaning noise	Brake linings contaminated with grease or oil.	INSPECT the brake pads and shoes for contamination. REPAIR or INSTALL new components as necessary.
Brake vibration/shudder - occurs when brakes are applied	Uneven disc or drum wear. Uneven disc brake pad or lining transfer. Suspension components.	GO to PINPOINT TEST A .
Brake vibration/shudder - occurs when the brake pedal is released	Brake drag.	INSPECT the disc brake pads or linings for premature wear. REPAIR or INSTALL a new caliper or wheel cylinder as necessary. REFER to DISC & DRUM for drum brakes.