Anti-lock brakes kick in at random times when brakes are applied

You may be at the end of the life for your brakes and or rotor / drum. If you can take it to a brake shop they usually will look at it for free.

The ABS system utilizes Sensors at the wheels, some form of modulator (the can release each wheel's brake individually) and a control module (could be part of the car's ECU).
If you're just replacing parts randomly, you will drop a lot of money and time and probably won't cure the actual issue.
Anti lock braking system
How Anti Lock Brakes Work HowStuffWorks

Anti-Lock Brake systems are all essentially the same they will prevent the driver form applying 100% Brake pressure and locking up the wheels while driving. The ratchet the pressure more slowly to prevent the car from skidding. Our first reaction in an emergency is to slam on the brakes and that is 90% of the time not the right action. So Anti-Lock brakes are designed to prevent this unwanted skid.

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Is it icy or snowy where you live? Sounds like anti-lock brakes kicking in... Can you freel it in your foot?

Those are your anti-lock brakes. Either there is a malfunction, or you are applying to much brake for the road conditions, which is causing the anti-lock brakes to activate. If the road conditions are slick and hazardous, slow down and start stopping sooner.

sounds like you have a wheel speed sensor going out.. need to have it scanned to see which one is dropping out and making abs kick in..

ABS stands for anti-lock brakes. Without going into a long explanation, when a vehicles brakes lock up, meaning the wheels are no longer rolling, a vehicile begins to slide and the driver cannot control where it slides.

To combat this, drivers were taught to pump their brakes so the tires could get some grip to the road to steer. With ABS, a computer does the pumping for you, much faster than you could ever respond, thus allowing you to steer around a hazard.

With ABS systems, in an emergency situation, you should apply the brakes firmly, and hold them, allowing the ABS to kick in. Do NOT pump the brakes, the biggest complaint from the people who investigate wrecks is that drivers tend to not apply the brakes as firmly as they need to.

You can probably google anti lock brakes systems and get some very good explanations woth more details.

Sounds like a faulty wheel sensor. I would suggest a trip to the repair shop.

if abs activates when it should not,,, it means abs module senses one or more wheel sensores under 3 mph and the other sensores are above 3 mph. .the cause of this is usualy a bad wheel speed sensor or excessive air gap between the sensor and ringwheel. you need an abs data scanner to hook up and go for a test drive to find out which sensor is the culprit.

Hi ,you should check the rear brakes of your vehicle ,it is posible that they are not returning back when the brake is applied,the brake cilinders may be staying open , c1