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: ABS Mark 70 (ABS/ASR) Exploded View

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Brake Line
- 14 Nm
- Brake master cylinder/primary piston circuit to the ABS Hydraulic Unit -N55-
- Identification: Pipe Fitting with M12 x 1 Threads
- 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: Pipe Fitting with M12 x 1 Threads
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Booster with Master Brake Cylinder
- Replace the complete brake booster if there are faults.
- Overview. Refer to OVERVIEW - BRAKE BOOSTER/BRAKE MASTER CYLINDER .
- The required vacuum is supplied either by the intake manifold or by a vacuum pump.
- Function Test:
  -- Forcefully press brake pedal several times with engine switched off. This dissipates any vacuum present in the unit.
  
  -- Hold the brake pedal with average foot pressure and start the engine. If the brake booster is working properly, the brake pedal will be felt to give noticeably under foot (booster becomes effective).
- Vacuum System, Checking. Refer to VACUUM SYSTEM, CHECKING .
- Brake booster, removing and installing. Refer to BRAKE BOOSTER, REMOVING AND INSTALLING .
- Brake master cylinder, removing and installing. Refer to BRAKE BOOSTER/BRAKE MASTER CYLINDER .
Brake Line
- 14 Nm
- To left rear brake caliper/brake cylinder
- Identification: Pipe Fitting with M12 x 1 Threads
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Line
- 14 Nm
- To the right rear brake caliper/brake cylinder
- Identification: Pipe Fitting with M10 x 1 Threads
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Rubber Bushing
WARNING:
When installing the bracket, make sure the rubber bushing 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-, REMOVING AND INSTALLING .
- Disconnecting from the ABS Control Module -J104-. Refer to ABS Control Module -J104-, DISCONNECTING FROM ABS Hydraulic Unit -N55-, ABS MARK 70 .
Bolt
- 5.5 Nm
- Always replace if removed
- Quantity: 3
ABS Control Module -J104-
- Removing and installing. Refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING .
- 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 brake master cylinder/primary piston circuit
- Identification: Pipe Fitting with M12 x 1 Threads
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Line
- 14 Nm
- To the left front brake caliper
- Identification: Pipe Fitting with M10 x 1 Threads
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Line
- 14 Nm
- To the right front brake caliper
- Identification: Pipe Fitting with M12 x 1 Threads
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .
Brake Line
- 14 Nm
- ABS Hydraulic Unit -N55- to the brake master cylinder/secondary piston circuit.
- Identification: Pipe Fitting with M12 x 1 Threads
- Brake Line, Connecting. Refer to BRAKE LINES, ATTACHING TO HYDRAULIC UNIT .