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.
Abs Control Module And Hydraulic Unit Assembly Overview
ABS/EDL/ASR/ESP, TRW
- ABS Control Module (w/EDL) -J104-
It is not possible to separate the control module and hydraulic unit.
- Removing and installing, refer to CONTROL MODULE AND HYDRAULIC UNIT .
- ABS Hydraulic Unit -N55-
It is not possible to separate the control module and hydraulic unit.
- Removing and installing, refer to CONTROL MODULE AND HYDRAULIC UNIT .
- Brake Line
- To right front brake caliper.
- Identification: 5.25 mm diameter and tube fitting with M10 x 1 thread
- Marked on hydraulic unit with "VR".
- Brake Line
- To left rear brake caliper.
- Identification: 5.25 mm diameter and tube fitting with shorter thread M12 x 1
- Marked on hydraulic unit with "HL".
- Brake Line
- To right rear brake caliper.
- Identification: 5.25 mm diameter and tube fitting with M10 x 1 thread
- Marked on hydraulic unit with "HR".
- Brake Line
- To left front brake caliper.
- Identification: 5.25 mm diameter and tube fitting with shorter thread M12 x 1
- Marked on hydraulic unit with "VL".
- Brake Line
- Master brake cylinder/primary piston circuit to hydraulic control unit.
- Identification: 8.5 mm or 6 mm diameter and tube fitting with longer thread M12 x 1
- Marked on hydraulic unit with "HZ1".
- Brake Line
- Master brake cylinder/secondary piston circuit to hydraulic unit.
- Identification: 8.5 mm or 6 mm and tube fitting with longer thread M12 x 1
- Marked on hydraulic unit with "HZ2".
- Heat Shield
Allocation.
- Bolt
- 12 Nm
- Brake Booster
- On vehicles with a hydraulic brake booster, a vacuum sensor is installed. Refer to the BRAKE BOOSTER VACUUM SENSOR .
- Removing and installing, refer to BRAKE BOOSTER .
- Bracket
- Nut
- 20 Nm
- Rubber Insulation
- Bolt
- 10 Nm
- Bracket
Use the Manual With the Right Hardware
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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.
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