WHAT IS THE ANTI-LOCK BRAKE (ABS) FLUID LEVEL SENSOR

What is the Anti-Lock Brake (ABS) Fluid Level Sensor  about?

While your ABS system needs electricity in order to work, it relies on hydraulic pressure to activate the brakes (same as your regular braking system). Because an ABS system has more intensive fluid requirement, such as sending additional fluid to the accumulator for use during actual ABS work, there must be a way to ensure that fluid levels are constantly checked. This is done by the anti-lock brake (ABS) fluid level sensor, or brake fluid level sensor, if you want it.

The fluid level sensor is completely what it sounds like. It’s an electronic sensor always installed in the body of the master cylinder with just one job – to monitor the level of fluid in the reservoir. It is an electrical switch that tells if the fluid is low by a change in electrical resistance. If the fluid level goes below a safe limit, the sensor sends a signal to the computer, which then turns on the ABS light in your dash (and then disables ABS).

Bear in mind:

  • The anti-lock brake fluid level sensor can fail over time because of a number of problems, but most commonly because of a lack of maintenance in terms of fluid replacements.
  • The fluid level sensor is not checked during normal maintenance, although the color and level of the brake fluid in the reservoir should be.

How it is done:

  • The anti-lock brake fluid level sensor is checked to see if it needs to be replaced
  • The defective anti-lock brake fluid level sensor is taken out
  • The new anti-lock brake fluid level sensor is mounted
  • The anti-lock brake fluid level sensor is tested for operation
  • The car is tested to ensure proper operation of the anti-lock brake fluid level sensor

Recommendation:

The brake fluid level sensor checks the level of fluid in the reservoir, and then sends that information to the brake system computer. The computer knows if the level is safe for operation, and if not, turns the ABS warning light in your dash on, and then disables the ABS system to stop potential damage. If your ABS light comes on, we recommend having the problem diagnosed by one of our expert mechanics immediately.

What common signs indicate you may need to replace the Anti-Lock Brake (ABS) Fluid Level Sensor?

  • ABS light is on
  • ABS system is not functioning

How important is this?

Without a functioning brake fluid level sensor, your braking computer will be unable to know whether there is enough fluid in the system for safe working, and will disable the ABS while turning on the brake warning light. You may not be able to stop your car in a controlled fashion or you may lock up the brakes on slippery surfaces, potentially causing an accident. Have the anti-lock ABS fluid level sensor changed if it is faulty.

SEE ALSO:WHAT CAUSES ABS LIGHT TO STAY ON