What Does the ABS Light Indicate and What Causes It to Appear?
dashboard lights are supposed to alert you when anything is wrong with your
car. When the ABS light illuminates, you may be concerned that the car is no
longer safe to drive. The only way to know for sure is to figure out what's
wrong with the vehicle that's creating the problem in the first place. You need
answers before you get back in your vehicle.
ABS light's meaning is explained in this guide. We also look at what's causing.
Finally, you'll be able to determine if it's safe to drive with this light on.
warning dashboard lights that are illuminated might result in a failed MOT, so
double-check your MOT status
and the issues repaired.
The ABS Light's Causes
ABS light is illuminated as a result of the following six issues:
1. Bad Speed Sensor - The
wheel speed sensor measures the pace at which the wheels move and transmits
that information to the ECU. The ECU can utilise this information to determine
how to employ the ABS. If the ECU detects that one of the wheels is travelling
faster than the others, it will release more brake fluid, allowing the wheel to
slow down and boost traction on the road. A failed MOT will be caused by a
defective wheel speed sensor, therefore check MOT status of
your car, and get the damaged wheel speed sensors replaced by a trained
mechanic.The ECU will not have reliable data if the speed sensor fails. Not
only will the ABS light illuminate, but you should also be aware that slamming
on the brakes might cause the car to lose traction. The traction control light
may also illuminate. The speed sensor is situated quite close to the wheels in
order to measure their speed. It suffers a great deal of damage as a result of
its proximity to the brakes and exposure to the extreme heat. It can also be
harmed by metal shavings or debris ejected by the brakes.
2. Faulty ABS tone Ring - The
ABS sensor requires something to read the wheel speed from, and the ABS tone
ring is that something. The ABS ring can get rusted and break, causing the ABS
sensor to produce an inaccurate measurement and the ABS light on your dashboard
to illuminate. If check MOT
history of your car and it shows that a prior failure was caused
by the ABS light being on, it's possible that the problem was caused by a
malfunctioning ABS ring.If certain ABS rings are inserted inside the wheel
bearing, the complete wheel bearing must be replaced. If it's on the
driveshafts, though, you can usually check it visually to see if there are any
fractures or other damage.
3. Faulty ABS Module or
Damaged Wirings – The ABS module might fail. The wiring, on the other
hand, may be to blame. These cables are prone to corrosion, which can cause
communication delays or failure between the ABS module and the speed sensor. It
would be preferable if the vehicle only required some new wiring. If you're
unlucky, you may need to replace the ABS module, which is far more expensive.
You should notice a lack of responsiveness from the brakes with either
condition. You may barely notice it on occasion at first, but it should
continue to worsen. It's also conceivable that the brakes could lock up or
those clicking noises will be heard.
4. Hydraulic Pump Failure -
The ABS system is responsible for controlling the braking fluid that passes via
the hydraulic pump. When the brake pedal is depressed, this pump pushes brake
fluid into the cylinder so that it may be supplied to the brakes. Based on the
speed sensor data, the ABS system regulates the braking pressure to each wheel.
With this knowledge, the proper quantity of fluid may be delivered to the
brakes where it is most needed.In the vast majority of circumstances, this
system performs as expected. However, the hydraulic pump might fail, or the
hydraulic system could have a defective valve. Neither of these scenarios are
ideal. The pump might wear out due to dirt and metal shavings from polluted
braking fluid. However, changing the fluid on a regular basis can assist
prevent this from happening. An illuminated ABS warning light is a common
reason for failure on a MOT
history check.When there are
problems with the pump, braking performance suffers. It will begin gently and
gradually worsen as you let it go. If the master cylinder fails, the brakes may
feel wonderful for a minute but then lose all power a split second later,
making driving extremely risky. A fluid leak might also occur as a result of
the flaw. If fluid is leaking out, the pedal may initially seem hard, but it
will become spongy as it lowers to the floor.
5. Blown Fuse - The ABS is
activated by the electrical components of your vehicle. The ABS, in fact, has
its own fuse. These fuses aren't impervious to failure. A fuse might blow at
any time for no apparent cause. It's not difficult to check the fuse,
thankfully. In fact, if you haven't seen any symptoms other than the dashboard
light, it might be the first step in diagnosing the problem.
6. Low Brake Fluid - For the
ABS pump to function properly, it requires brake fluid. To feed the braking
system, this fluid is pumped through the cylinder. You'll have problems if you
don't have enough brake fluid, which might include an activated ABS light. It's
critical to determine why the fluid level is low. A leaking fluid reservoir,
air in the braking system, or a cracked seal are all possibilities. It can also
occur if the brakes are worn out. If you let the system to drop too low, the
ABS module won't be able to equalise the pressure between each tyre, resulting
in skidding and slippage. As the brake fluid level drops, you may notice that
stopping gets more difficult. When you brake, there's also a potential that
you'll make more noise.