Transcript REAR ANTI-LOCK BRAKES

REAR ANTI-LOCK
BRAKES
COMPONENTS
RABS Module
 RABS Valve
 RABS Speed Sensor
 RABS ABS Warning Light
 RABS Diagnostic Connector
 RABS Diode/Resistor Element
 RABS Sensor Test Connector
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RABS MODULE
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Usually located
inside vehicle.
Senses wheel
speed other inputs
Controls RABS
valve and warning
light
Performs selfdiagnostics
Single Channel
WHEEL SPEED SENSOR
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Located in Rear
Axle
Provides signal in
form of AC Voltage
Direct input to
Module
Excitor Ring and
Sensor Pole Piece
LAB PAGE 159
CLASS PAGE 163
WHEEL SENSOR
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Voltage Generator
Air Gap (.050)
Magnetic Field
around the coil
Exciter Ring
interrupts the
magnetic field
Sensor Test Conn.
RABS VALVE
Page 191C
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Two Solenoid Unit to
open or close
hydraulic circuits
Inlet/Isolation Valve
Outlet/Dump Valve
Built in accumulator
OPEN AND CLOSED ABS
SYSTEMS
Description Page 181C
RABS DIAGNOSTIC
CONNECTOR
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Ford RAB systems
have no diagnostic
memorys for codes.
Usually single
terminal connectors
Flashes Amber light
Ground terminal to
activate self test
FLASHOUT CHART - L232
DIODE/RESISTOR
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Located in main
harness under dash
Isolates RAB
module from parking
brake switch
THE END