Chapter 73. Anti-Lock Brakes, Traction Control, and Stability Control. Contents. Anti-lock brake systems (ABS) Traction and stability control systems ABS service Traction and stability control system service Final system check. Anti-Lock Brake Systems (ABS).
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Traction Control, and
An ABS uses wheel speed sensors, a computer (ECM), and a modulatorunit to prevent skidding during hard braking
With ABS cars tend to travel further during hard braking
Uses wheel speed sensor inputs to control the electro-hydraulic modulator
Wheel sensors produce an ac signal that corresponds to wheel and tire speed
moving teeth on the sensor rotor induces current in the wheel sensor coil
The accumulator in the ABS system stores high pressure fluid and Caution should be used when servicing!
Here, the brakes are applied, and pressure is being dumped from one wheel to prevent lockup
Above: Using a hand-held scope and measuring the wheel sensor signal
Typical scan tool connections
This tester can be placed on the seat to check operating values during a road test
If applicable, use a non-metal feeler gauge to check the air gap
Replace any clips that retain the wiring
Connect a jumper wire or make scan tool selections to apply or release the wheel brake assemblies as needed
With the brake applied, rotate each wheel, verifying the ability to apply or vent pressure at each brake assembly
Transfer the necessary parts from theold unit to the new one
Special procedures may be required; follow the manufacturer’s instructions
Control System Service