How it works
The ABS (Anti-lock Braking System) is an important component of a car's electrical system. Naturally it is installed in many Volvo models too, which are famous to be among the most safest vehicles. When installed, then even the inexperienced drivers can avoid accidents and dangerous situations on the road.
The ABS is responsible to keep the car straight and make it stop on the possible shortest way in case of sudden braking. The basic goal is to avoid locking all or any wheel during braking, since this tremendously would increase the braking distance and make the car uncontrollable. Drivers can not control brake pressure in case of emergency, they can not think logically so they just hit it to the maximum. This is the time when the brain of the whole operation, the ABS control module steps in. It continuously receives individual wheel and car speed related information from sensors and if it sees that one or more wheels are getting close to lock up and make the car unstable than it releases the brake pressure on those by opening and closing hydraulic valves.
The driver can hear and feel some buzzing noise and shaking during this process and dotted rubber marks can be visible on the dry road behind.
Depending on the available options, during driving the same ABS control module can be responsible for slip and stability control too. Even on a straight road during rainy or icy weather one side of the car can run on a slippery area that would immediately make the car uncontrollable spin. The ABS control system makes the necessary adjustments and slows the over-spinning wheels back to the normal driving speed.
If your ABS control module is faulty you can remove it and send it to us for repair. The car is usually drivable without the control module since the basic brake system's hydraulic parts are separated.