Bosch ESP9 ABS unit repair - C123EF0 - Hydraulic Brake Booster - Limit value reached

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Our assessment fee is $150 + GST.
If you choose to proceed with the repair, this fee is applied towards the total repair cost. It is only charged separately if you decide not to proceed after the assessment.

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Audi ABS Repair – C123EF0 Fault Code: Hydraulic Brake Booster – Limit Value Reached

This is a professional repair service for Audi ABS control modules suffering from the C123EF0 fault – Hydraulic Brake Booster - Limit Value Reached. This issue is typically found in Audi vehicles built between 2010 and 2020, including:

Audi A4, A5, A6, A7, S4, S5, Q5, Q7

Common Part Numbers Affected:

8R0 614 517 T

8R0 614 517 R

8K0 907 379 AD

4M0 907 379

8K0 907 379 AE

4G0 614 517 T

4G0 907 379 A

4M0 907 379 R

Other variants and supersessions of these part numbers may also be covered — contact us if you’re unsure.

Common Symptoms:

  • ABS warning light illuminated

  • Traction control light on

  • “Brake system fault – stop carefully” displayed

  • Degraded braking performance

  • Emergency braking functions may be reduced or disabled

Important Note: This fault is often caused by a vacuum issue in the vehicle. The fault code will not clear until both the mechanical issue is resolved and the ABS module is properly reset or repaired.

What We Do:

At Get Electronic, we perform a complete teardown and component-level repair of your ABS unit, including:

  • Bench testing of communication and fault logging

  • Targeted circuit board repairs

  • Cleaning and resealing

We can remove the C123EF0 fault code from the ABS module once the vehicle’s vacuum issue is corrected. The repaired module will then accept a clear scan and function as intended.