ABS Mark 70, ABS and ASR

Hydraulic Unit and Brake Booster/Master Cylinder Assembly Overview





1 Anti-lock Brake System (ABS) control module (w/Electronic Differential Lock (EDL) (J104)

• Removing and installing, refer to => [ Control Module and Hydraulic Unit ] Service and Repair.

2 ABS hydraulic unit (N55)

• Removing and installing, refer to => [ Control Module and Hydraulic Unit ] Service and Repair.

3 Brake line

• Master cylinder/primary piston circuit to hydraulic control unit.

• Identification: Tube fitting with M10 x 1 threads.

4 Brake line

• Master cylinder/secondary piston circuit to hydraulic unit.

• Identification: Tube fitting with M12 x 1 threads.

5 Brake line

• To left front brake caliper.

• Identification: Tube fitting with M12 x 1 threads.

6 Brake line

• To right front brake caliper.

• Identification: Tube fitting with M10 x 1 threads.

7 Brake line

• To left rear brake caliper.

• Identification: Tube fitting with M12 x 1 threads.

8 Brake line

• To right rear brake caliper.

• Identification: Tube fitting with M10 x 1 threads.

9 Inner Torx bolt, 5.5 Nm

• Use new bolts.

10 Bracket

11 Hex bolt, 8 Nm

12 Gasket

• For brake booster.

13 Brake booster

• Vacuum is supplied from the intake manifold.

• Function test:

- With engine switched off, press brake pedal firmly several times (to deplete vacuum).

- Press and hold brake pedal with average foot pressure and start engine. If the brake booster is working properly, the pedal will be felt to give noticeably under foot (booster assistance becomes effective).

• Replace as a unit in the event of malfunction (previously, check all vacuum lines).

• Removing and installing, refer to => [ Brake Booster ] Brake Booster.

14 Seal

15 Master cylinder

• Cannot be serviced. Replace as complete unit if malfunctioning.

• Removing and installing, refer to => [ Master Cylinder ] Service and Repair.

16 Hex nut, 25 Nm

• Always replace after removal.

17 Sealing plugs

• Lubricate with brake fluid and press into brake fluid reservoir.

18 Brake fluid reservoir

19 Cap

20 Sealing plugs

• Connection for vacuum hose.

21 Vacuum hose

• Insert into brake booster.

22 Brake booster pressure sensor (G294)

• On vehicles with Fuel Straight Injection (FSI) engine without hydraulic brake vacuum booster.

• Removing and installing, refer to => [ Brake Booster Pressure Sensor ] Service and Repair.