Larry’s Auto & Truck Service Center
Cape Coral, Florida

ASE National Institute for Automotive Service Excellence
International Automotive Technicians Network

(ABS) Anti-Lock Brakes Repair & Service for Cars & Trucks

There are four main components to an ABS system:

  • Speed sensors
  • Pump
  • Valves
  • Controller
Anti-Lock Brake Indicator

Speed Sensors
The anti-lock braking system needs some way of knowing when a wheel is about to lock up. The speed sensors, which are located at each wheel, or in some cases in the differential, provide this information.

There is a valve in the brake line of each brake controlled by the ABS.

Since the valve is able to release pressure from the brakes, there has to be some way to put that pressure back. That is what the pump does; when a valve reduces the pressure in a line, the pump is there to get the pressure back up.

The controller is a computer in the car. It watches the speed sensors and controls the valves.

Brake Types
Anti-lock braking systems use different schemes depending on the type of brakes in use.

  • Four-channel, four-sensor ABS
  • Three-channel, four-sensor ABS
  • Three-channel, three-sensor ABS
  • Two-channel, four sensor ABS
  • One-channel, one-sensor ABS

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Family Owned and Operated Since 1983!