This will cause the ABS control module to get tricked and thinking the car is sliding on a slippery surface. The ABS sensors measure the speeds of each wheel, and if one of the ABS sensors has gone bad, it will read the wrong speed on one or more wheels. RELATED: What does the ABS light mean & What Causes it? 2. In rare cases, defective ABS wheel speed sensors can cause the speedometer to stop registering. However, when the other systems stop functioning properly, you might also see the traction and stability control warning lights. When the ABS wheel speed sensor fails, the ABS light is probably one of the first signs you will notice out of all the bad ABS wheel speed sensor symptoms.Īt first, it might simply cause the ABS warning light to come on. Your dashboard contains a variety of important lights that alert you to danger. Here is a more detailed list of the signs of a bad or failing ABS wheel speed sensor to look for: 1. This is mainly because the ABS control module will light up the ABS warning light and deactivate the system to prevent accidents. You may also notice other warning lights on the dashboard, such as the check engine light or traction control light.Īs you can see, there are actually not that many ways to tell if an ABS sensor has gone bad. The most common symptoms of a bad ABS sensor are an ABS warning light on the dashboard, pulsating brake pedal, loss of anti-lock brakes, or loss of traction control. To determine if your vehicle has ABS, consult an owner’s manual or look for an ABS light on the dashboard.Conclusion Symptoms Of A Bad ABS Wheel Speed Sensor federal mandate requires all new cars and minivans made in or after 2012 to have four-wheel ABS. It’s typically found on pickup trucks that have rear-wheel ABS. This system has one valve and one speed sensor to monitor all four wheels and is located in the rear axle. Because the rear wheels are monitored together, both wheels must lock up to trigger ABS. The rear wheels share a valve and one speed sensor in the rear axle. In this system, both front wheels have individual valves and speed sensors. This setup is found on pickup trucks featuring four-wheel ABS. The ABS will only pulse on the single wheel that’s about to lock up, giving drivers better traction control. It’s considered the best system because it monitors individual wheels, ensuring maximum braking force. This system has a separate speed sensor and valve on all four wheels. There are three basic types of anti-lock brake systems.įour channel, four sensor ABS. This is rapid opening and closing of the valves - or the brakes “pumping.” Types of ABS When the anti-lock brake system is working, drivers will feel the brake pedal pulsing. However, because of the ABS, the tire slows down at the same rate as the vehicle. The controller will then use a pump to increase pressure again until the wheel decelerates again. When the ABS controller detects rapid deceleration or an emergency stop, it uses a valve in the brake line to reduce pressure to the wheel. The ABS controller is always looking out for rapid deceleration, an early signal for wheel lock. The system relies on sensors that constantly monitor the speed of the vehicle’s wheels. The ABS comprises wheel speed sensors, an electronic control unit (ECU), valves, and a pump. Today, ABS does this for drivers, only faster and more accurately. An overview of how ABS worksīefore anti-lock brakes, drivers were taught to “pump their brakes” when they start to skid on slippery roads. But on slippery surfaces, ABS activated by hard braking may increase stopping distance while allowing drivers to keep steering control. On most surfaces, a vehicle equipped with ABS will likely stop faster than one without. However, ABS doesn’t necessarily shorten a vehicle’s stopping distance. ABS is particularly important for controlling wheel speed on loose gravel or slippery surfaces. Without the ABS, drivers can lose steering control of their vehicles while skidding and potentially overturn. The ABS allows drivers to retain more control of the vehicle by modifying brake pressure. The ABS senses when wheels are about to lock during an emergency braking situation and releases enough brake force to maintain traction with the road surface. It is a safety feature that prevents wheels from locking up while braking to avoid skidding.ĪBS consists of computer sensors and solenoid valves which monitor wheel speed.
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