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 MANUALSAUDI2025Q4 E-TRON PREMIUM PLUS, AWDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTILOCK BRAKE SYSTEM45 ANTILOCK BRAKE SYSTEMCONTROL MODULE AND HYDRAULIC UNITOVERVIEW - CONTROL MODULE AND HYDRAULIC UNITOVERVIEW - CONTROL MODULE AND HYDRAULIC UNIT, LHD
2025 Audi Q4 e-tron Premium Plus, AWD
Overview - Control Module And Hydraulic Unit, LHD
2025 Audi Q4 e-tron Premium Plus, AWDSECTION Overview - Control Module And Hydraulic Unit, LHD
- ABS Control Module -J104-
- Brake Line to Right Rear Brake Cylinder
- 5.25 mm diameter and union bolt with shorter thread M12 x 1
- With commercially available standard tools: 14 Nm
- With special tools Mini Torque Wrench VAS 6854, Torque Wrench - Universal Joint VAG 1410/7 and Open Ring Spanner Insert - AF 11mm VAG 1410/6: 12 Nm
- Brake Line to Left Front Brake Caliper
- 5.25 mm diameter and union bolt with thread M 10 x 1
- With commercially available standard tools: 14 Nm
- With special tools Mini Torque Wrench VAS 6854, Torque Wrench - Universal Joint VAG 1410/7 and Open Ring Spanner Insert - AF 11mm VAG 1410/6: 12 Nm
- Brake Line to Right Front Brake Caliper
- 5.25 mm diameter and union bolt with shorter thread M12 x 1
- With commercially available standard tools: 14 Nm
- With special tools Mini Torque Wrench VAS 6854, Torque Wrench - Universal Joint VAG 1410/7 and Open Ring Spanner Insert - AF 11mm VAG 1410/6: 12 Nm
- Brake Line to Left Rear Brake Cylinder
- 5.25 mm diameter and union bolt with thread M 10 x 1
- With commercially available standard tools: 14 Nm
- With special tools Mini Torque Wrench VAS 6854, Torque Wrench - Universal Joint VAG 1410/7 and Open Ring Spanner Insert - AF 11mm VAG 1410/6: 12 Nm
- ABS Hydraulic Unit -N55-
- Torx Bolt
- Quantity: 4
- Replace after removing
- Refer to Fig 2
- Brake Line to Master Brake Cylinder Secondary Piston Circuit
- 6 mm diameter and union bolt with thread M 12 x 1
- With commercially available standard tools: 14 Nm
- With special tools Mini Torque Wrench VAS 6854, Torque Wrench - Universal Joint VAG 1410/7 and Open Ring Spanner Insert - AF 11mm VAG 1410/6: 12 Nm
- Brake Line to Master Brake Cylinder Primary Piston Circuit
- 6 mm diameter and union bolt with thread M 12 x 1
- With commercially available standard tools: 14 Nm
- With special tools Mini Torque Wrench VAS 6854, Torque Wrench - Universal Joint VAG 1410/7 and Open Ring Spanner Insert - AF 11mm VAG 1410/6: 12 Nm
- Rubber Bushing
- Bracket
- Brake Booster -NX6-
- Bolt
- Quantity: 3
- 20 Nm
- Bracket
- Bolt
- Quantity: 2
- 8 Nm
| Step | Bolt | Tightening Specification/Additional Turn |
|---|---|---|
| 1 | -1- through -4- | 1.25 Nm |
| 2 | -1- through -4- | 3.5 Nm |
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.