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.
Overview - Control Module And Hydraulic Unit, LHD
2025 Audi Q3 PremiumSECTION Overview - Control Module And Hydraulic Unit, LHD
vehicle with vacuum brake booster is shown.
- ABS Control Module -J104-
- The ABS Control Module -J104- can be replaced separately if faulty.
- A faulty ABS Hydraulic Unit -N55- must be replaced together with the ABS Control Module -J104-
- Refer to ABS Control Module -J104- / ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING
- Refer to CONTROL MODULE, SEPARATING FROM HYDRAULIC UNIT
- Refer to CONTROL MODULE, INSTALLING ON HYDRAULIC UNIT
- ABS Hydraulic Unit -N55-
- The ABS Control Module -J104- can be replaced separately if faulty.
- A faulty ABS Hydraulic Unit -N55- must be replaced together with the ABS Control Module -J104-
- Refer to ABS Control Module -J104- / ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING
- Bolt
- Replace after removing
- Tightening Specifications
- 1. Step: 1 to 1.5 Nm (to position the seal)
- 2. Step: 2.5 Nm
- Brake Line
- To the right rear brake caliper
- License plate: 5.25 mm diameter and union bolt with M12x1 thread
- Do not change the bending shape.
- Replace a damaged or bent brake line
- Tightening Specifications
- With standard tool: 14 Nm
- With special tool Refer to Fig 2 12 Nm
- Brake Line
- To the left front brake caliper
- License plate: 5.25 mm diameter and union bolt with M12x1 thread
- Do not change the bending shape.
- Replace a damaged or bent brake line
- Tightening Specifications
- With standard tool: 14 Nm
- With special tool Refer to Fig 2 12 Nm
- Brake Line
- To the right front brake caliper
- License plate: 5.25 mm diameter and union bolt with M12x1 thread
- Do not change the bending shape.
- Replace a damaged or bent brake line
- Tightening Specifications
- With standard tool: 14 Nm
- With special tool Refer to Fig 2 12 Nm
- Brake Line
- To the left rear brake caliper
- License plate: 5.25 mm diameter and union bolt with M12x1 thread
- Do not change the bending shape.
- Replace a damaged or bent brake line
- Tightening Specifications
- With standard tool: 14 Nm
- With special tool Refer to Fig 2 12 Nm
- Brake Line
- For brake master cylinder/primary piston circuit to hydraulic unit
- License plate: 6 mm diameter and union bolt with M12x1 thread
- Do not change the bending shape.
- Replace a damaged or bent brake line
- Tightening Specifications
- With standard tool: 14 Nm
- With special tool Refer to Fig 2 12 Nm
- Brake Line
- From brake master cylinder/secondary piston circuit to hydraulic unit
- License plate: 6 mm diameter and union bolt with M12x1 thread
- Do not change the bending shape.
- Replace a damaged or bent brake line
- Tightening Specifications
- With standard tool: 14 Nm
- With special tool Refer to Fig 2 12 Nm
- Brake Booster
- Mounting Bracket
- Bolt
- 8 Nm
- Rubber Bushing
- Heat Shield
- There are different versions. Refer to the Electronic Parts Information (ETKA) for the allocation.
- Version with threaded connection. Refer to Fig 3.
- Nut
- 20 Nm
- Bracket
- Nut
- 20 Nm
Special tools and workshop equipment required
- Open Ring Spanner Insert - AF 11mm :V.A.G 1410/6
- Torque Wrench - Universal Joint :V.A.G 1410/7
- Mini Torque Wrench :VAS 6854
- Replace the self-locking nut after removing.
-- Tighten the nut -1- for the heat shield -2- to 8 Nm.
-- Press on the bracket for the lock washer -3- all the way.
RENDER: 1.0x
NO RELATED
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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.