Removing and installing brake system pressure accumulator VX70, RHD vehicles — VW

Removing and installing
brake system pressure accumulator
VX70
, RHD vehicles
Special tools and workshop equipment required
Torque wrench
V.A.G 1331
Torque wrench
V.A.G 1410
Tool inserts (11 mm)
V.A.G 1331/2
Brake filling and bleeding equipment
VAS 5234
Sealing plug repair kit
1H0 698 311 A
Sealing plug
5Q0 698 311
1
Sealing plug M10
2
Sealing plug M12
Location:
The
brake system pressure accumulator
VX70
is located on left-hand side of the engine compartment.
1
Brake servo and brake master cylinder
2
Brake system pressure accumulator
VX70
3
ABS control unit
J104
with
ABS hydraulic unit
N55
Removing:
Observe safety precautions when working in the area of high-voltage components
Chapter
.
Observe the risk classification of the high-voltage system
Electric drive
Rep. gr.
00
Risk classification of the high-voltage system
.
DANGER
Danger to life due to high voltage.
Risk of severe or fatal injury due to electric shock.
The high-voltage system must be de-energised by a suitably qualified technician.
De-energise high-voltage system now
Electric drive
Rep. gr.
93
De-energising high-voltage system
.
Disconnect battery
Electrical system
Rep. gr.
27
Battery; Disconnecting and reconnecting battery
.
Disconnect connector
3
.
Release hose clip
1
and remove coolant hose.
Remove coolant expansion tank from bracket. To do this, release catch
2
with a thin screwdriver.
Unscrew nut
2
and remove bracket
1
.
Move coolant hoses and electrical wiring away from the area of the
brake system pressure accumulator
VX70
.
Draw off as much brake fluid as possible from brake fluid reservoir using
brake filling and bleeding equipment
VAS 5234
.
Place sufficient lint-free cloths in the area of the
brake system pressure accumulator
VX70
1
.
Unscrew brake lines
2
from
brake system pressure accumulator
VX70
1
.
To do this, unscrew union nuts
3
.
Seal threaded hole immediately using
sealing plugs
1H0 698 311 A
or
sealing plugs
5Q0 698 311
.
Fit dust caps from the brake caliper bleeder valves onto brake lines.
Release and pull off connector
4
.
Pull
brake system pressure accumulator
VX70
1
together with bracket
3
and rubber dampers
2
upwards off bracket.
Installing:
Install in reverse order. Note the following points:
Ensure rubber dampers are seated correctly in bracket of
brake system pressure accumulator
VX70
.
Ensure that retaining pins have been fully and evenly inserted into rubber dampers.
Ensure secure seating by pulling.
WARNING
Ensure that rubber dampers of retainer are not pressed out of bracket when installing. After installation, check that the
brake system pressure accumulator
VX70
is securely seated, otherwise malfunction can occur.
Bleed brake system
Chapter
.
Subsequently bleeding the brake system
Chapter
.
Perform basic setting for electromechanical brake servo
Vehicle diagnostic tester
.
Specified torques
Chapter
“
Assembly overview –
Brake system pressure accumulator
VX70
, LHD vehicles
”
Electrical system
Rep. gr.
27
Battery; Removing and installing battery
.