Symptoms of a Bad or Failing ABS Fluid Level Sensor

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The ABS system is an additional safety feature that is now mandatory on all late model vehicles. The ABS system uses electronic sensors to detect wheel speed conditions and rapidly pulse the brakes to prevent the tires from skidding, and can rapidly stop the vehicle. The ABS system uses an electrical control module, and a series of sensors, one of which is the ABS fluid level sensor.

The ABS fluid level sensor is responsible for detecting the amount of brake fluid present in the vehicle’s brake master cylinder reservoir. This is important for the module to know because the entire braking system, as well as the ABS system operates using hydraulic brake fluid, and will not function correctly if the level falls below a certain minimum. When the ABS sensor fails, it will usually display a few symptoms that can alert the driver that there may be a problem that should be serviced.

1. The ABS Light is on

One of the first things that may happen when the ABS sensor fails is the ABS Light will come on. The ABS Light will usually come on when it is detected by the computer that the sensor has failed or is sending an incorrect signal, which may cause the ABS system to have problems. The ABS Light can also come on for a variety of other reasons so if it does become illuminated, scan the vehicle for trouble codes to reveal clues as to what the possible problem may be.

2. Unexpected wheel lock

Another symptom of a problem with the ABS fluid level sensor is a malfunctioning ABS system. Usually, the ABS system will activate automatically during heavy braking situations where wheel lock occurs. However, if the ABS fluid level sensor fails, and the level falls below a certain point, then the ABS system may not do this. This may leave the vehicle prone to unexpected wheel lock and tire skidding if the system is not functioning correctly.

2. Low fluid in reservoir

Another symptom of a failed ABS fluid level sensor is a low fluid level. This is usually indicative of two problems. One, that the fluid has somehow escaped from the system, perhaps through a leak or evaporation; and two, that the fluid level dropped and it was not picked up by the sensor. Usually, if the fluid level is low and the light has not come on, then the sensor is defective and should be replaced.

Because the ABS fluid level sensor is important to the overall functionality of the ABS system, if it fails, the problem can quickly transfer over to the rest of the system. If you suspect that your ABS fluid level sensor has failed, or your ABS Light has come on, have the vehicle diagnosed by a professional technician, such as one from YourMechanic, to determine if the vehicle needs an ABS fluid level sensor replacement, or perhaps another issue that needs to be addressed.


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Rigoberto

9 years of experience
706 reviews
Rigoberto
9 years of experience
Chevrolet Equinox - Brake Pads Replacement (Rear) - Niles, Illinois
Rigo was great! He got there early, finished the job early, left everything clean. He changed my rear pads and rotors. The original quoted time was 90 minutes, he was done in about 60. He knows what he is doing and I am recommending him to all my friends and coworkers.
Mercedes-Benz C250 - Brake Pads Replacement (Front, Rear) - Chicago, Illinois
Rigo is a maverick hands down. Don’t take your car for work elsewhere. Especially great at Mercedes—this guy knows his profession! I will be using him for everything related to my car going forward.

Arturo

25 years of experience
35 reviews
Arturo
25 years of experience
Kia Forte - Brake Pads Replacement (Front) - San Diego, California
ARTURO is great! very professional , fast, replaced my front brake pads and oil an filter change. everything now works and works well. Brakes have much improved stopping power and engine is smooth and quiet.Arturo is also kind and thoughtful. "Your mechanic" is very fortunate to have Arturo Lopez represent your company. I enthusiastically recommend him and "Your mechanic> as a fine operation Best regards to the Team Peter Marto
Nissan Maxima - Brake Pads Replacement (Front, Rear) - San Diego, California
Arturo was prompt and completed my brake repair, including new rotors in a very efficient manner. I am very pleased with the quality of the work and the parts and will definitely look to have him service our other car in the near future.

Scott

32 years of experience
345 reviews
Scott
32 years of experience
Lexus IS250 - Brake Pads Replacement (Rear) - Denver, Colorado
Always on time, speedy, professional, and pleasant to interact with. The work is always consistent and we'll done. I can't reccomend Scott highly enough!

Michael

10 years of experience
15 reviews
Michael
10 years of experience
Nissan Sentra - Brake Pads Replacement (Front) - Conyers, Georgia
He was promptly on time and got the job done efficiently in a timely manner. I really appreciate the rapid respone on getting the job done! I would most definitely use this service again.

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