Overview - Control Module And Hydraulic Unit, Abs Mark 70

CAUTION: Do not confuse the brake lines when connecting them to the tandem master cylinder and the ABS Hydraulic Unit -N55-. Mark the lines in their installed position before removing them.

Fig 1: Exploded View Of ABS Control Module

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Brake Line
- 14 Nm
- Brake master cylinder/primary piston circuit to the ABS Hydraulic Unit -N55-
- Identification: Tube fitting with threads M12 x 1
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Line
- 14 Nm
- Brake master cylinder/secondary piston circuit to the ABS Hydraulic Unit -N55-
- Identification: Tube fitting with threads M12 x 1
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Booster with Master Brake Cylinder
- Overview. Refer to OVERVIEW - BRAKE BOOSTER/BRAKE MASTER CYLINDER .
- The required vacuum is supplied either by the intake manifold or by a vacuum pump.
- Functional check:
  -- Forcefully press brake pedal several times with engine switched off. This dissipates any vacuum present in the unit.
  
  -- Depress and hold brake pedal with average foot pressure and start engine. If brake booster is working properly, pedal will be felt to give noticeably under foot (booster assistance becomes effective).
- Replace the complete brake booster if there are faults.
- Vacuum System, Checking. Refer to VACUUM SYSTEM, CHECKING .
- Brake booster, removing and installing. Refer to BRAKE BOOSTER .
- Brake master cylinder, removing and installing. Refer to OVERVIEW - BRAKE BOOSTER/BRAKE MASTER CYLINDER .
Brake Line
- 14 Nm
- To left rear brake caliper/brake cylinder
- Identification: Tube fitting with threads M12 x 1
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Line
- 14 Nm
- To the right rear brake caliper/brake cylinder
- Identification: Tube fitting with threads M10 x 1
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Rubber Buffer
WARNING: When installing the mount, make sure the rubber insulation does not push out of the bracket. Make sure the ABS Hydraulic Unit -N55- is secure after installing it otherwise malfunctions can occur.
Bracket
- Is attached to the body
Nut
- 8 Nm
- Quantity: 2
Bolt
- 8 Nm
- Quantity: 2
Bracket
ABS Hydraulic Unit -N55-
- Removing and installing. Refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55- .
- Disconnecting from the Anti-lock Brake System (ABS) Control Module -J104-. Refer to ABS Control Module -J104-, DISCONNECTING FROM ABS Hydraulic Unit -N55-, ABS MARK 70 .
Bolt
- 5.5 Nm
- Quantity: 3
- Always replace if removed
Anti-lock Brake System (ABS) Control Module -J104-
- Removing and installing. Refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55- .
- Disconnect from the ABS Hydraulic Unit -N55-. Refer to ABS Control Module -J104-, DISCONNECTING FROM ABS Hydraulic Unit -N55-, ABS MARK 70 .
Brake Line
- 14 Nm
- ABS Hydraulic Unit -N55- for the master brake cylinder/primary piston circuit.
- Identification: Tube fitting with threads M12 x 1
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Line
- 14 Nm
- To the left front brake caliper
- Identification: Tube fitting with threads M10 x 1
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Line
- 14 Nm
- To the right front brake caliper
- Identification: Tube fitting with threads M12 x 1
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Line
- 14 Nm
- ABS Hydraulic Unit -N55- for the master brake cylinder/secondary piston circuit.
- Identification: Tube fitting with threads M12 x 1
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .