Symptom Table

SYMPTOM TABLE

Condition	Possible Sources	Action
No communication with the module - unable to carry out on-demand self test with the driver seat module (DSM) (Navigator only)	Fuse(s). Circuitry. Driver seat module (DSM).	GO to PINPOINT TEST A .
The red brake warning indicator is always on	Brake fluid level.	FILL the brake fluid reservoir to the MAX line.
	Circuitry. Instrument cluster.	REFER to INSTRUMENT CLUSTER .
	Brake master cylinder.	CARRY OUT the Brake Master Cylinder Component Test.
Red brake warning indicator inoperative	Circuitry. Bulb.	REFER to PINPOINT TEST L: THE BRAKE WARNING INDICATOR IS NEVER/ALWAYS ON .
The brakes pull or drift	Tire air pressure.	CHECK the tires for uneven or excessive wear and correct inflation.
	Brake pads.	CHECK the brake pads for uneven taper or excessive wear. REPAIR as necessary.
	Brake components.	CHECK the brake discs and the hubs for damage. REPAIR as necessary.
	Suspension component. Wheel alignment.	CHECK wheel alignment. REFER to WHEEL ALIGNMENT ANGLES .
Brake pedal goes down fast	Brake fluid level.	INSPECT the system for leaks. FILL the brake master cylinder reservoir. BLEED the system. REFER to BRAKE SYSTEM BLEEDING .
	Air in system.	INSPECT the system for leaks. BLEED the system. REFER to BRAKE SYSTEM BLEEDING .
	Brake master cylinder.	CARRY OUT the Brake Master Cylinder Component Test.
The brake pedal eases down slowly	Air in system.	INSPECT the system for leaks. BLEED the system. REFER to BRAKE SYSTEM BLEEDING .
The brake pedal eases down slowly	Brake master cylinder.	CARRY OUT the Brake Master Cylinder Component Test.
Brake lockup under light brake pedal force	Brake pads.	CHECK the brake pads for uneven taper or excessive wear. REPAIR as necessary.
	Brake component.	CHECK the brake components for correct operation. REPAIR as necessary.
	Parking brake component.	REPAIR or INSTALL new components as necessary. REFER to PARKING BRAKE .
	Anti-lock brake control system.	CHECK the anti-lock brake control system. REFER to VEHICLE DYNAMIC SYSTEMS .
Excessive/erratic brake pedal travel	Leak in hydraulic system. Air in system. Disc brake caliper.	INSPECT the system for leaks. BLEED the system. REFER to BRAKE SYSTEM BLEEDING .
	Brake master cylinder.	CARRY OUT the Brake Master Cylinder Component Test.
	Brake pads.	CHECK the brake pads for excessive wear.
	Brake pedal.	CHECK the brake pedal for binding or obstructions. REPAIR as necessary.
Brakes drag	Parking brake component.	REPAIR or INSTALL new components as necessary. REFER to PARKING BRAKE .
	Brake caliper guide pins.	REPAIR or INSTALL new caliper guide pins, seals and boots. REFER to BRAKE CALIPER GUIDE PINS .
	Disc brake caliper.	REPAIR or INSTALL new brake calipers as necessary. REFER to REMOVAL AND INSTALLATION for front disc brakes or REMOVAL AND INSTALLATION for rear disc brakes .
	Brake booster.	CARRY OUT the Brake Booster Component Test.
	Brake master cylinder.	CARRY OUT the Brake Master Cylinder Component Test.
Excessive brake pedal effort	Brake booster.	CARRY OUT the Brake Booster Cylinder Component Test.
	Brake booster check valve.	CARRY OUT the Check Valve Component Test.
	Brake booster manifold vacuum hose.	REROUTE, REPAIR or INSTALL new components as necessary.
Rattling noise	Caliper mounting bolts loose.	CHECK the caliper bolts. TIGHTEN to specifications. REFER to BRAKE CALIPER for front disc brakes or BRAKE CALIPER for rear disc brakes .
	Damaged or worn caliper guide pins or retainers.	CHECK the caliper guide pins and retainers for lubrication and correct operation. LUBRICATE or INSTALL new components as necessary. REFER to BRAKE CALIPER GUIDE PINS .
	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 BRAKE PADS for front disc brakes or BRAKE PADS for rear disc brakes .
	Loose brake disc shield.	TIGHTEN the brake disc shield bolts to specification. REFER to REMOVAL AND INSTALLATION for front disc brakes or REMOVAL AND INSTALLATION for rear disc brakes .
Clicking noise - with brakes applied with anti-lock brake system (ABS)	ABS hydraulic control unit.	Acceptable condition.
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 or linings worn below minimum thickness.	INSPECT brake pads for excessive wear, taper wear or uneven wear. VERIFY brake pads are within minimum specifications. REFER to BRAKE PADS .
Squealing noise - an intermittent squeal brought on by cold, heat, water, mud or snow	Brake pads.	Acceptable condition.
Groaning noise - occurs at low speeds with brake lightly applied (creeping)	Brake pads.	Acceptable condition.
Grinding noise - continuous	Brake pads or linings worn below minimum thickness.	INSPECT the brake pads, brake discs and attaching hardware for damage. VERIFY brake pads are within minimum specifications. REFER to BRAKE PADS .
Moaning noise	Brake linings contaminated with grease or oil.	INSPECT the brake pads for contamination. REPAIR or INSTALL new components as necessary. REFER to BRAKE PADS for front disc brakes or BRAKE PADS for rear disc brakes .
Brake pedal application feels abnormal	Power brake booster input shaft.	CHECK the orientation of the power brake booster input shaft; the offset (if present) must be downward. If incorrect, CORRECT as necessary.
Adjustable brake pedal does not operate correctly - system without memory	Motor. Obstruction(s). Cable. Switch.	GO to PINPOINT TEST B .
Adjustable brake pedal does not operate correctly - does not operate using the adjustable pedal switch (Navigator only)	Fuse. Circuitry. Switch. Adjustable pedal motor. Driver seat module (DSM).	GO to PINPOINT TEST C .
Adjustable brake pedal does not operate correctly - does not operate using the memory set switch (Navigator only)	Fuse. Circuitry. Switch. Adjustable pedal motor. Driver seat module (DSM).	GO to PINPOINT TEST D .
Adjustable brake pedal does not operate correctly - does not operate using the remote transmitter (Navigator only)	Fuse. Circuitry. Switch. Adjustable pedal motor. Driver seat module (DSM). Remote transmitter.	GO to PINPOINT TEST E .
Vibration when the brakes are applied	Uneven brake pad wear. Brake disc pad transfer. Brake disc. Suspension components.	COMPLETE the brake system inspection described in Inspection and Verification . GO to PINPOINT TEST F .
Brake vibration/shudder - occurs when the brake pedal is released	Brake caliper guide pins.	INSPECT the brake caliper guide pins for correct operation. REFER to BRAKE CALIPER GUIDE PINS .
	Brake drag.	INSPECT the brake pads for premature wear. REPAIR or INSTALL a new caliper as necessary. REFER to REMOVAL AND INSTALLATION for front disc brakes or REMOVAL AND INSTALLATION for rear disc brakes .