Solenoid ABS Brief Review

Administrator posted this 18 June 2019

What does the ABS Solenoid do in your car? Long story short, ABS is the anti-lock braking system, and you can easily get access to the information through the OBD-II DLC. ABS is very important for your safety, as its main and preferable task is to prevent wheel lock during braking. The functionality of the Anti-lock Braking System is procured by modulator, valves and solenoids inside it. The controller receives the brake pressure from the main cylinder, and puts under the control the pressure in the wheels.

In case of emergency braking, one or more wheels can be locked. In this case, the entire stock of traction is used in the longitudinal direction. The locked wheel ceases to perceive the lateral forces holding the car on a given trajectory, and slides on the road surface. The car loses control, and the slightest lateral force leads it to drift.

Modern electronics (ABS, traction control system, ESP) are designed to control the transverse and longitudinal dynamics of the car. The system takes into account not only the speed of the wheels but also the steering angle, the degree of body roll, acceleration... the Pressure in the brake circuits is generated from the totality of the data obtained, additionally, in some cases, the engine thrust is forcibly changed.

The List of ABS Solenoid Falts includes 8 Trouble Codes (Circuit Malfunction):

  • C0060 - Left Front Wheel ABS Solenoid 1
  • C0065 - Left Front Wheel ABS Solenoid 2
  • C0070 - Right Front Wheel ABS Solenoid 1
  • C0075 - Right Front Wheel ABS Solenoid 2
  • C0080 - Left Rear Wheel ABS Solenoid 1
  • C0085 - Left Rear Wheel ABS Solenoid 2
  • C0090 - Right Rear Wheel ABS Solenoid 1
  • C0095 - Right Rear Wheel ABS Solenoid 2

Consequently, the ABS system has eight solenoids, two for each wheel. The system is also equipped with four additional solenoids, the task of which is to block the main cylinder, thereby coordinating the supply of pressure to the wheels of the pump. Operation of solenoids, inlet/outlet valves, and the pump in HCU (Hydrualic Control Unit) - ensures the maintenance of normal tire pressure.

Mechanical faults with ABS are the rare case, for instance, corrosion or contaminated brake fluid can lead to the stacking of pintles & the standstill of valve seats. It is quite difficult to detect mechanical faults in the ABS system and eliminate them. This process requires a detailed and careful diagnosis mechanic at the service station.

Electrically testing of solenoids is able to show more faults and set a code for them. Testing the unit with a scan tool with bidirectional control might be the best way to confirm their condition.

Finally, what are the main symptoms for Trouble Codes out of ABS Group?

ABS Light  the first info about errors in the system you can see on cars OBD computer. The signals ABS\TRC will light up on the dash, it is a reason to connect the adapter and run diagnostics.

Brake locking  If you noticed that the wheels are blocked during the driving, obviously the ABS module is damaged. You should immediately to find the reason and solve the problem.

Brake Pedal is Unresponsive  If you push down the braking pedal several times in order to stop the car, you are at risk. One day that won’t work, sadly, brakes are going to inappropriately fail, and you can get into the car crash.

The Increased Effort with Brake Pedal  the situation is almost similar to the last one described above. The problem lies in how much effort you have pressing on the braking pedal. The car goes well with you, but for that, you put more pressure.

Speedometer Fails  A rare symptom, however, directly related to THE abs block. The speedometer shows the wrong speed, the arrow always shows zero.

The replacement of the ABS unit or its separate parts is a costly procedure. But to ignore and postpone the problem in any case impossible.