Symptom Chart - Brake System (Hybrid Vehicles)

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART - BRAKE SYSTEM (HYBRID VEHICLES)

Condition	Possible Sources	Action
The red brake warning indicator and the yellow ABS warning indicator are illuminated	DTCs in the ABS module	REFER to DIAGNOSIS AND TESTING to diagnose the ABS.
The red brake warning indicator is always/never on	Brake fluid level switch Parking brake switch Wiring, terminals or connectors Instrument Cluster (IC) Smart Junction Box (SJB) DTCs present in the ABS module	REFER to DIAGNOSIS AND TESTING to diagnose the red brake warning indicator.
Brakes drag	Parking brake component	REFER to DIAGNOSIS AND TESTING to diagnose the parking brake system.
	Incorrect brake shoe adjustment	REFER to BRAKE SHOE ADJUSTMENT for the brake shoe adjustment procedure.
	Wheel cylinder(s) Brake flexible hose Brake caliper and/or guide pins	INSPECT the brake system components. REFER to BRAKE SYSTEM INSPECTION .
	Brake booster Brake master cylinder	CARRY OUT the Brake Master Cylinder - Compensator Port Component Test in this article.
	Pedal assembly	RETRIEVE and RECORD any ABS module DTCs, REFER to DTC CHARTS . INSTALL new components as necessary.
Brakes lock up under light brake pedal force	Brake calipers and/or guide pins Wheel cylinders and/or brake hardware Brake flexible hose Brake pads/shoes Brake discs/drums	INSPECT the brake system components. REFER to BRAKE SYSTEM INSPECTION .
	Pedal assembly	RETRIEVE and RECORD any ABS module DTCs, REFER to DTC CHARTS . INSTALL new components as necessary.
	Anti-lock brake system	REFER to DIAGNOSIS AND TESTING to diagnose the ABS.
Vehicle pulls or drifts during braking	Brake calipers and/or guide pins Wheel cylinders and/or brake shoe hardware Brake flexible hose Brake pads/shoes Brake discs/drums	INSPECT the brake system components. REFER to BRAKE SYSTEM INSPECTION .
	Tires	REFER to DIAGNOSIS AND TESTING to diagnose tire concerns.
	Suspension component(s) and/or wheel alignment	REFER to DIAGNOSIS AND TESTING to diagnose suspension system.
Excessive brake pedal travel (low/spongy pedal)	Brake pedal assembly Brake booster Wiring, terminals or connectors Anti-lock brake system	RETRIEVE and RECORD any ABS module DTCs, REFER to DTC CHARTS . INSTALL new components as necessary.
Excessive brake pedal effort	Brake pedal assembly Vacuum source Brake booster manifold vacuum hose Brake booster Brake booster check valve	RETRIEVE and RECORD any ABS module DTCs, REFER to DTC CHARTS . INSTALL new components as necessary.
Excessive brake pedal effort	Brake pads	INSPECT the brake pads. REFER to BRAKE SYSTEM INSPECTION .