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ABS Warning light on ? 
Private Customers, Fleet  & Motor trade Welcome. Unsure if you should drive the vehicle with a dash warning light on - We provide a mobile service that comes  to you.

ABS Anti-Lock Braking System Function
The purpose of an anti-lock braking system is to allow the driver to maintain control of the vehicle direction and stability during braking on a variety of road surface conditions to minimise stopping distance.

Components and Operation

Wheel Speed Sensors and Exciter rings
Wheel Speed sensors measure the rotational speed of individual road wheels to produce an electrical signal which is sent back to an anti lock braking system control module. Wheel speed sensor signal may also be used for road speed measurement.

Brake Pedal Switch
A brake pedal switch  signal to the ABS controller  ensures the system is only functional during brake operation.

ABS Control Module and ModulatorThe Antilock braking system control module compares the input signals from each wheel speed sensors during braking to recognise if a potential lock up condition may occur. The ABS control module output function uses solenoids to regulate the  the brake control valve pressure of the affected wheel to prevent the wheel from locking.

The ABS control module can be sensitive to power supply faults including incorrect battery voltage

ABS Warning lamp function

The ABS Warning lamp should illuminate when the ignition is switched on then go out after a system self check has been performed. Should the ABS warning lamp fail to come on or remain constantly lit during vehicle operation then a system fault may be present.

ABS System Fault Diagnostics
Modern vehicle ABS may be interrogated using serial diagnostics with a scan tool with suitable software. Use of either multimeter or oscilloscope may be required for further system signal testing.

MoT fail
A permanently illuminated ABS warning lamp will often result in MoT test failure as it represents a dangerous condition.

Typical ABS Faults

Faulty wheel speed sensors, damaged or dirty rotor sensor ring, faulty modulator solenoids, abnormal battery voltage, system pressure faults, wiring faults.

Brake Pad Fitting
Mobile service for fitting of  Brake Pads, Brake disc rotors  , Brake Shoes, Brake Drums, Wheel cylinders, Brake Calipers,  Handbrake cables.