Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI2018A5 QUATTRO PRESTIGE, 2D CONVERTIBLEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 272 (ANTILOCK BRAKE SYSTEM (2 OF 2))45 ANTILOCK BRAKE SYSTEMCONTROL MODULE AND HYDRAULIC UNITOVERVIEW - CONTROL MODULE AND HYDRAULIC UNIT
2018 Audi A5 Quattro Prestige, 2D Convertible
Overview - Control Module And Hydraulic Unit
2018 Audi A5 Quattro Prestige, 2D ConvertibleSECTION Overview - Control Module And Hydraulic Unit
WARNING: This page is about a different car, the 2022 Audi A4 allroad, 2021 Audi A4 allroad, and 2020 Audi A4 allroad. However, it is still accessible from the selected car via links, so may be relevant.
Control Module and Hydraulic Unit
- Rubber Bushing
- Mounting Bracket
- Bolt
- Tighten in two steps alternating from side to side.
- Step 1: 1 to 1.5 Nm (to position the seal)
- Step 2: 2.5 Nm
- ABS Control Module -J104-
- If the ABS Control Module -J104- is faulty, it can be replaced separately.
- If the ABS Hydraulic Unit -N55- is faulty, it must be replaced together with the ABS Control Module -J104-.
- Refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING
- Can be replaced separately if faulty.
- Refer to CONTROL MODULE, SEPARATING FROM HYDRAULIC UNIT
- Refer to CONTROL MODULE, INSTALLING ON HYDRAULIC UNIT
- Brake Line
- 14 Nm
- Replace a damaged or bent brake line
- To the brake caliper
- Do not change the bending shape.
- ABS Hydraulic Unit -N55-
- If the ABS Control Module -J104- is faulty, it can be replaced separately.
- If the ABS Hydraulic Unit -N55- is faulty, it must be replaced together with the ABS Control Module -J104-.
- Brake Line
- 16 Nm
- Replace a damaged or bent brake line
- From brake master cylinder to the hydraulic unit
- Do not change the bending shape.
- Brake Line
- 14 Nm
- Replace a damaged or bent brake line
- From brake master cylinder to the hydraulic unit
- Do not change the bending shape.
- Bolt
- 25 Nm
ABS Control Module -J104-
Fig 2: Identifying Pressure Sensor Contact, Pressure Sensor, Seal, Valve Bodies And Pump Motor Contact
- Pressure Sensor Contact
- Do not touch the contacts
- The illustration depends on the model
- Pressure Sensor
- Must not be changed or damaged
- Cannot be replaced
- The illustration depends on the model
- Seal
- Do not remove or lift
- Cannot be replaced separately
- Valve Body
- Must not be damaged
- Do not use any tools
- Pump Motor Contact
- Must not be damaged
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.