Ford Freestar, Monterey 2004-2006

Description & Operation

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The Anti-lock Brake System (ABS) module, with or without stability assist, simultaneously manages the anti-lock braking, traction control and engine control systems to maintain vehicle control during deceleration and acceleration.

When the ignition switch is in the RUN position, the module carries out a preliminary electrical check and, at approximately 12 mph (20 km/h), the hydraulic pump motor is turned on for approximately one half-second. Any malfunction of the anti-lock brake system disables the traction control and stability assist (if equipped) and the anti-lock brake warning indicator illuminates. However, the power-assist braking system functions normally.

The Anti-lock Brake System (ABS) consists of the following components:



Hydraulic Control Unit (HCU)
 
ABS module
 
Front wheel speed sensors and sensor rings (part of the front hub and bearing assembly)
 
Rear wheel speed sensors
 
Rear wheel speed sensor rings (part of the rear hub and bearing assembly)
 
Yellow ABS warning indicator
 

The front wheel speed sensors and front wheel speed sensor rings are integral to the front hub and bearing assemblies.

The rear wheel speed sensor rings are integral to the rear hub and bearing assembly.

The ABS with traction control and stability assist consists of these additional components:



Accelerometer
 
Yaw rate sensor (contained in the accelerometer)
 
Steering wheel rotation sensor
 
Traction control switch
 
Trac off indicator
 

 
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