Removing and installing brake system pressure accumulator VX70 — AUDI

Removing and installing
brake system pressure accumulator
VX70
Special tools and workshop equipment required
Brake pedal actuator
V.A.G 1869/2
Bleeder bottle from
brake filling and bleeding equipment
VAS 5234
Sealing plugs from
assembly parts set
5Q0 698 311
M10 sealing plugs
M12 sealing plugs
Removing
DANGER!
High voltage can cause fatal injury.
Danger of severe or fatal injuries from electric shock.
The high-voltage system must be de-energised by a
“high-voltage technician”
.
Work on the de-energised high-voltage system may only be performed by an
“electrically instructed person”
.
De-energise high-voltage system
Rep. gr.
93
De-energising high-voltage system
.
Remove
power and control electronics for electric drive
JX1
Rep. gr.
93
Power and control electronics for electric drive; Removing and installing power and control electronics for electric drive
.
Insert
brake pedal actuator
V.A.G 1869/2
between brake pedal and driver's seat. Depress brake pedal at least 60 mm.
Note
This closes the valves in the brake master cylinder and stops the brake fluid reservoir from running empty.
WARNING
Risk of skin irritation
Always wear chemical-resistant protective gloves to prevent brake fluid from contacting skin.
Detach protective cap
3
from bleeder screw
1
on front left brake caliper.
Connect hose
2
from bleeder bottle, as shown in illustration.
Open bleeder screw to relieve pressure in brake system.
Close bleeder screw and remove bleeder bottle.
Repeat procedure on rear left brake caliper.
Note
The
brake pedal actuator
V.A.G 1869/2
must not be removed.
Place a cloth under the connection to catch escaping brake fluid.
Unscrew union screws
arrows
and detach brake line
1
.
Seal open connections immediately using clean sealing plugs from
assembly parts set
5Q0 698 311
.
Unplug electrical connector
2
.
Pull
brake system pressure accumulator
VX70
item 1
upwards off retaining pins and remove.
If renewing
brake system pressure accumulator
VX70
, remove bolts
arrows
and detach bracket
1
.
Installing
Installation is performed in reverse sequence; note the following:
Pre-bleed new
brake system pressure accumulator
VX70
before installing
Chapter
.
Insert
brake system pressure accumulator
VX70
with bracket in engine compartment.
Position brake line
1
, screw in union screws
arrows
by hand and tighten.
Remove
brake pedal actuator
V.A.G 1869/2
.
Bleed brake system
Chapter
.
DANGER!
High voltage can cause fatal injury.
Danger of severe or fatal injuries from electric shock.
The high-voltage system must be re-energised by a
“high-voltage technician”
.
Re-energise high-voltage system
Rep. gr.
93
Re-energising high-voltage system
.
WARNING
Risk of accident!
Make sure that the brakes work properly before the vehicle is driven on the road.
Tightening torques
Chapter
“
Exploded view - brake servo / brake master cylinder,
brake system pressure accumulator
VX70
for vehicles with high-voltage system
”