Skip the auto shop - Our mechanics make house calls

How Anti-Lock Brakes Work

How Anti-Lock Brakes Work

An anti-lock brake system (ABS) is a braking system that is made to allow a vehicle to maintain traction with the road when braking. Braking is controlled by driver input via the brake pedal, and older braking systems response to a driver braking suddenly or with intense pressure was sometimes to lock up or skid. The ABS is meant to prevent the wheels from locking up or from unnecessary skidding while braking. The automated system uses the principles of both cadence and threshold braking, which were previously practiced by skilled drivers with early generation braking systems. Modern ABS accomplishes these principles with better control and much faster than a driver could.

Today's anti-lock braking system gives the driver better vehicle control and reduces stopping distances on slippery and dry surfaces. However, on loose gravel and snow, anti-lock brakes can increase stopping distance, though the improved vehicle control remains the same.

Components of the ABS

  • Speed sensors: Speed sensors are also called wheel sensors or wheel speed sensors. This part uses a magnet and a wire to generate a signal that is sent to the sensor.

  • Valves: Each brake controlled by the ABS has a brake line and a valve. The valve has three positions, controlling the amount of pressure exerted on each brake, to minimize wheel lock or skidding.

  • Pump: This piece of the system is used to restore pressure to the brakes after the valve has released the pressure. As the pressure applied by the driver decreases, the pump will help to equalize the pressure in the brake lines.

  • Controller: An Electronic Control Unit (ECU) receives the information from the wheel speed sensor and uses that information to perform the task of applying the brakes with the proper amount of pressure needed.   

These pieces work together to keep proper pressure in the brake lines to help stop a vehicle from skidding or experiencing wheel lock when trying to stop suddenly or in bad weather.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...


Related questions

Q: How do I adjust the side view mirrors in a 2012 Dodge Ram?

You can control your side view mirrors with the side view switches, which are located on the control panel on the inside of the driver’s door. At the top of this control panel are two buttons, labeled “L” and “R”...

Q: Had both break and ABS light on then my brother floored it in reverse then it was driving but ABS is still on but drove home fine

Hello. When the ABS and brake lights come on, most of the time the vehicle is still safe to drive as long as the brake pedal feels fine. It is still important that the vehicle is checked out right away....

Q: Parking lights won't turn off - 2000 Dodge Ram 2500

Hello. There could be a problem with the wiring of the electronic brake or the wiring for the trailer. Another possibility is that the headlight switch or its wiring going bad as well. The wiring to the electronic brake, trailer,...