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ABS Brake Repairs Tamworth

ABS Brake Repairs Specialist Services.

Call For A Free ABS Brake Repairs Quote: 01827 874430

Anti-lock braking system (ABS) are automatic brake mechanisms that allows the wheels on a car to maintain contact with the road surface according to driver inputs while braking.

ABS prevents the wheels from locking up to avoiding uncontrolled skidding. ABS does this at a much faster rate and with better control than a driver could manage.

An ABS has speed sensors placed in the car wheel.  The ABS will sense when a wheel has stopped moving and when other wheels continue to turn.  It will sense that this wheel is skidding and will tell the ABS controller to pump the power to that wheel in the attempt to regain traction.

ABS is usually a central control unit with a number of inputs and outputs.

The most important and prone to failure are the wheel speed sensors.   Most of these are simple inductance sensors and work in conjunction with a toothed or magnetic wheel or bearing.

As the toothed wheel rotates this generates a signal, the frequency and voltage or which are proportional to wheel speed.  This signal is used by the ECU.  Most systems though now use hall effect sensors.

The Electronic contol unit is normally built into the Hydraulic Modulator although they can also be seperate items.  These are usually a very expensive item and can be prone to failure also.  The ECU records the data from the wheel speed sensors and calculates what action be taken by the Hydraulic Modulator.

The hydraulic modulator has 3 operating positions:

1. Pressure build up brake line open to the pump
2. Brake line closed/pressure hold
3. Release of pressure/brake line closed to resertion.  The valves are controlled by solenoids.  The motor only runs when ABS is activated.

If a fault in the system occurs the ABS turns itself off and brings on the car’s ABS light.

Call For A Free ABS Brake Repairs Quote: 01827 874430

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