Abs Control Unit Cost in 2024.

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What is an ABS control unit and how does it work?

The Anti-Lock Braking (ABS) control unit is made up of three parts, a pump that builds pressure in the brake lines when called upon, a block to which the brake lines are connected, and a module that controls ABS function. Sometimes called an “ABS block” or “ABS pump”, this unit responds to signals from the wheel speed sensors when they detect that a tire has lost traction.

Without ABS, when your tires lock up during hard braking (or braking on water, snow, or loose gravel), they begin to skid, and they lose their ability to steer in one direction or another. Your vehicle skids forwards - and sometimes slides sideways.

ABS prevents your tires from locking up in those conditions. When a wheel speed sensor detects that a tire has stopped rotating (and is about to skid), it alerts the ABS control unit, which then pulses pressure to the brake pads to slow the wheel down without stopping it completely. In the process, the tire maintains more surface contact with the road and allows you to continue to steer your vehicle. ABS also helps to prevent your vehicle from entering into a dangerous sideways skid or slide.


How is a an ABS Control Unit done?

The procedure to replace an ABS control unit differs from one vehicle make and model to another. Some require that the brake lines be removed; others do not. An example of the steps a technician might need to take in order to replace an ABS control unit is as follows:

  • Disconnect the negative terminal of the battery, taking care to preserve the vehicle computer memory
  • Raise and support the vehicle in the air (some models)
  • Disconnect the brake lines connected to the ABS control unit block and capture any residual brake fluid (care must be taken as some units have brake fluid that is under high pressure)
  • Detach the wiring connectors to the control unit
  • Unbolt and remove the control unit from the vehicle
  • Install the new unit
  • Reconnect the wire harness plug
  • Attach the brake lines to the new control unit block
  • Replace the brake fluid that was lost during the procedure
  • Bleed the brakes of air Some new ABS control units require that the technician also use a scan tool to program the unit after installation.

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National average cost of a an ABS Control Unit
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How do I know if my vehicle needs a new ABS hydraulic control unit?

If your ABS control unit fails, your vehicle will still have the ability to stop. But it will no longer have an anti-lock braking function. A Traction Control Systems (TCS) often relies on the ABS control unit as well, so you could also lose TCS function if the unit fails. Signs that there is a problem with your ABS control unit include:

The ABS light on the dash comes on

A trouble code related to the ABS is revealed in a diagnostic scan

You do not hear the telltale clicking sound of the ABS during hard braking or during other conditions where the ABS would normally engage (snow, wet pavement, loose gravel)

The ABS unit engages in an overactive manner when you are braking on dry, non-slippery surfaces

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Other questions customers ask

Can an ABS module be repaired?
An ABS module is not usually something that can be repaired by your local mechanic. If proper diagnosis shows that your ABS module has failed, the usual course of action is to replace it with a new or rebuilt component sourced from a reputable auto parts dealer.
Can I drive with a broken ABS system?
Your vehicle will still operate with a faulty ABS system, and your brakes will still work. You should be aware, however, that the ABS will not operate and the traction control system may also fail as a result of a bad ABS control unit. It should also be noted that driving with no ABS can be dangerous depending on the driving conditions in which you operate your vehicle and should be avoided.
Why do ABS units fail?
ABS units fail for a variety of reasons. Typical causes of malfunction are wiring issues (such as corrosion or damaged connectors), or old or contaminated brake fluid that creates sludge inside the ABS pump.

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