Removing and installing ABS hydraulic unit N55 with vehicle stabilising programme hydraulic pump V156 — VW

Removing and installing
ABS hydraulic unit
N55
with
vehicle stabilising programme hydraulic pump
V156
Special tools and workshop equipment required
Torque wrench
V.A.G 1331
Brake pedal depressor
V.A.G 1869/2
The
ABS hydraulic unit
N55
and the
vehicle stabilising programme hydraulic pump
V156
are located on the left of the engine compartment.
1
Hydraulic unit with ABS return flow pump.
Hydraulic unit and ABS return flow pump are one unit and must always be replaced together in the event of complaints.
2
Hydraulic pump for vehicle stabilising programme with brake pressure sender.
Vehicle stabilising programme hydraulic pump and brake pressure sender are one unit and must always be replaced together in the event of complaints.
WARNING
Do not bend the brake lines in the area of the hydraulic unit!
Removing
Note or request radio code on vehicles with coded radio if necessary.
Disconnect battery.
Release hydraulic unit connector
arrow 1
and pull off
arrow 2
.
Fit
brake pedal actuator
V.A.G 1869/2
.
Actuate brake pedal with
brake pedal actuator
V.A.G 1869/2
.
Connect bleeder bottle hose to front left brake caliper bleed screw and open bleed screw.
Close front left bleeder screw.
Place sufficient lint-free cloths under the hydraulic unit.
Ensure no brake fluid gets onto contacts.
This work sequence is only valid for removal of the hydraulic unit.
Disconnect brake lines on the hydraulic unit.
Seal brake lines and threaded holes with plugs from repair set Part No. 1H0 698 311 A.
Unscrew hexagon nuts from hydraulic unit bracket
arrows
.
Remove hydraulic unit together with control unit.
This work sequence is only valid for removal of the
ABS hydraulic unit
N55
and the
vehicle stabilising programme hydraulic pump
V156
.
Unscrew power steering reservoir
1
and place to side with hoses still connected.
Unscrew coolant expansion tank
2
and place to side with coolant hoses still connected.
Vehicles with electric vacuum pump
Remove electric vacuum pump
Chapter
.
Continuation for all vehicles
Remove brake lines on the hydraulic unit and vehicle stabilising programme hydraulic pump.
Seal brake lines and threaded holes with plugs from repair set Part No. 1H0 698 311 A.
Pull connector off vehicle stabilising programme hydraulic pump.
Pull brake fluid supply hose off vehicle stabilising programme hydraulic pump.
Remove securing bolts on hydraulic unit bracket.
Take hydraulic unit with vehicle stabilising programme hydraulic pump off upwards.
Installing
Do not remove sealing plugs from new hydraulic unit until corresponding brake line is to be fitted.
Install in reverse order.
The
vehicle stabilising programme hydraulic pump
V156
must be activated first to bleed the brake system.
Perform activation of vehicle stabilising programme hydraulic pump in display group number 2 of "Introduce basic settings" via
basic setting in
“guided fault finding”
mode with the
vehicle diagnosis, testing and information system
VAS 5051
.
Select
“Select function/component”
by pressing
Go to
button.
Bleed brake system
Chapter
.
Enter radio code.
Code control unit
Coding control unit with the
vehicle diagnosis, testing and information system
VAS 5051
in
“guided fault finding”
mode
.
Torque settings:
Brake lines to ABS unit and vehicle stabilising programme hydraulic pump:
Thread M10 x 1
14 Nm
Thread M12 x 1
14 Nm
Hexagon nut for
ABS hydraulic unit
N55
to bracket
Item
.
Hexagon nut for
vehicle stabilising programme hydraulic pump
V156
to bracket
Item
.
Hexagon bolt for bracket to body
Item
.