Symptom Chart: Brake System
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to: Diagnostic Methods .
| Condition | Possible Sources | Actions |
|---|---|---|
| The red brake warning indicator and the yellow ABS warning indicator are illuminated | Diagnostic Trouble Codes (DTCs) in the ABS | CHECK for ABS diagnostic trouble codes (DTCs). Refer to: Anti-Lock Brake System (ABS) And Stability Control . |
| The red brake warning indicator is always/never on | Brake fluid level switch Parking brake switch Wiring, terminals or connectors IPC BCM |
REFER to: Instrument Panel and Interior Switches Illumination . |
| Vehicle pulls or drifts during braking | Brake calipers and/or guide pins Brake flexible hose Brake pads Brake discs |
INSPECT the brake system components. Refer to: Brake System Inspection . Install new components as necessary. |
| Tires | REFER to: Wheels and Tires . | |
| Suspension component(s) and/or wheel alignment | REFER to: Suspension System . | |
| Brake pedal goes down fast or eases down slowly | Brake fluid leaks and/or air in the system | INSPECT the system for leaks. REPAIR as necessary. BLEED the system. Refer to: Brake System Pressure Bleeding . |
| Brake master cylinder | CARRY OUT the Component Test- Brake Master Cylinder - Bypass Condition . | |
| HCU | REFER to: Anti-Lock Brake System (ABS) And Stability Control . | |
| Brake pedal | INSPECT the brake pedal simulator spring, cam and interface-to-booster. INSTALL a new brake pedal and bracket as necessary. Refer to: Brake Pedal and Bracket . | |
| Brakes lock up under light brake pedal force | Brake pads Brake flexible hose Brake disc Brake calipers and/or guide pins |
INSPECT the brake system components. Refer to: Brake System Inspection . Install new components as necessary. |
| ABS | REFER to: Anti-Lock Brake System (ABS) And Stability Control . | |
| Brake pedal | INSPECT the brake pedal simulator spring, cam and interface-to-booster. INSTALL a new brake pedal and bracket as necessary. Refer to: Brake Pedal and Bracket . | |
| Excessive brake pedal travel (low/spongy pedal) | Brake fluid leaks and/or air in the system | INSPECT the system for leaks. REPAIR as necessary. BLEED the system. Refer to: Brake System Pressure Bleeding . |
| Brake master cylinder | CARRY OUT the Component Test- Brake Master Cylinder - Bypass Condition . | |
| Brake calipers and/or guide pins | INSPECT the brake calipers and guide pins. Refer to: Brake System Inspection . Install new components as necessary. | |
| Brake flexible hose | INSPECT the brake flexible hoses during brake application. INSTALL a new brake hose as necessary. Refer to: Front Brake Flexible Hose . Refer to: Rear Brake Flexible Hose . | |
| Brake pedal | INSPECT the brake pedal simulator spring, cam and interface-to-booster. INSTALL a new brake pedal and bracket as necessary. Refer to: Brake Pedal and Bracket . | |
| Erratic brake pedal travel | Brake pedal | INSPECT the brake pedal for binding, obstructions and correct interface to booster rod. REPAIR as necessary. CHECK the brake pedal fasteners for correct torque. Refer to: Brake Pedal and Bracket . |
| ABS | REFER to: Anti-Lock Brake System (ABS) And Stability Control . | |
| Brake drag | Parking brake component | INSPECT the parking brake system. Refer to: Parking Brake Actuator Motor . |
| Brake caliper and/or guide pins Brake flexible hose Brake booster |
INSPECT the brake system components. Refer to: Brake System Inspection . INSTALL new components as necessary. | |
| Brake master cylinder | CARRY OUT the Component Test- Brake Master Cylinder - Compensator Port . | |
| Hydraulic Control Unit (HCU) | REFER to: Anti-Lock Brake System (ABS) And Stability Control . | |
| Stoplamp switch | VERIFY correct installation of the stoplamp switch. Refer to: Stoplamp Switch . | |
| Brake pedal | INSPECT the brake pedal simulator spring, cam and interface-to-booster. INSTALL a new brake pedal and bracket as necessary. Refer to: Brake Pedal and Bracket . | |
| Excessive brake pedal effort | Insufficient vacuum for brake booster operation Brake booster manifold vacuum hose Brake booster Brake booster check valve Brake booster vacuum pump |
CHECK for ABS diagnostic trouble codes (DTCs). Refer to: Anti-Lock Brake System (ABS) And Stability Control . |
| Brake pedal | INSPECT the brake pedal simulator spring, cam and interface-to-booster. INSTALL a new brake pedal and bracket as necessary. Refer to: Brake Pedal and Bracket . | |
| Brake pads | INSPECT the brake pads. Install new components as necessary. Refer to: Front Brake Pads . Refer to: Rear Brake Pads . |