Anti-Lock Brake System: Description

Anti-Lock Brake System (ABS) prevents wheel lock-up, allowing driver to maintain steering control during heavy braking. ABS consists of an Electronic Control Unit (ECU), actuator (electro-hydraulic unit), ANTI-LOCK warning light, wheel speed sensors, wiring and hydraulic lines. See ELECTRICAL COMPONENT LOCATIONS table. See Fig 1

ELECTRICAL COMPONENT LOCATIONS

Component

Location

Actuator

Below Brake Master Cylinder

ECU

Behind Driver's Kick Panel

Relays

⁽¹⁾ On Left Strut Tower

Wheel Speed Sensor

Front

At Wheel Hub

Rear

At Wheel Hub

⁽¹⁾	Large relay is motor relay. Small relay is solenoid valve relay.

NOTE: For more brake system information, see BRAKE SYSTEM article in the BRAKES section.

Fig 1: Locating ABS Components

Courtesy of NISSAN MOTOR CO., U.S.A.