Hydraulic unit, servo brake/ brake cylinder - assembly overview MK 20 — VW

VW
Golf
1999
Golf
2007
Running gear
Brake systems
Edition
08.2013
Hydraulic unit, servo brake/ brake cylinder - assembly overview MK 20
The full brake cylinder and the servo brake can be independently replaced.
WARNING
Always replace self-locking nuts and bolts subject to angular torque
Brake servo
in vehicles with ABS/EDS ASR/ESP, another servo brake is installed
Chapter
on gasoline engines, the vacuum required is removed from the intake manifold.
on diesel engines, a vacuum pump is installed to create vacuum.
check the operation
Press the brake pedal several times until the end with the engine stopped (This eliminates any remaining vacuum inside the device)
Now, press the brake pedal with medium strength and switch the engine on. With the servo brake operating correctly, this may be felt when the operator's foot is on the brake pedal (active amplification).
in case of faults, replace completely
Check valve (in the vacuum hose)
Anchor
Check the operation
Anchor
Disassemble from the brake pedal
Chapter
.
remove and install
Chapter
Closing cover
Brake fluid reservoir
Sealing plug
moisten with brake fluid and press in the brake cylinder
Retaining pin
insert through the brake cylinder
Brake master cylinder
other two pressure sensors are installed in vehicles with ABS/EDS/ASR/ESP.
Chapter
cannot be repaired. Where faults occur, replace completely.
Self-locking hexagonal nut
change
20 Nm
Setscrew
8 Nm
Cover nut
20 Nm
ABS hydraulic unit
N55
for ABS/EDS
in the
ABS hydraulic unit
N55
the
ABS hydraulic pump
V64
and the intake and exhaust valves are verified, by means of self-diagnosis
the
ABS hydraulic pump
V64
V64
and the valve block cannot be separated.
when replacing the
ABS hydraulic unit
N55
, close the old part with the plugs from the repair set
remove and install
remove and install
Chapter
ABS control unit
J104
for ABS/EDS
is checked through self-diagnosis
do not disconnect the multiple connector before concluding the self-diagnosis. Before disconnecting the connector, turn the ignition off
remove and install
Chapter
Brake pipe connection
from the
ABS hydraulic unit
N55
to the left front brake caliper
Brake pipe connection
from the
ABS hydraulic unit
N55
to the wheel cylinder / right rear brake caliper
Brake pipe connection
from the
ABS hydraulic unit
N55
to the wheel cylinder/left rear brake caliper
Brake pipe connection
from the
ABS hydraulic unit
N55
to the right front brake caliper
Brake pipe connection
from the brake master cylinder/pressure plunger loop to the
ABS hydraulic unit
N55
Brake pipe connection
from the brake cylinder/floating plunger loop to the
ABS hydraulic unit
N55
Self-locking hexagonal nut
change
20 Nm
Thermal protection plate
correspondence
Electronic Parts Catalogue
Self-locking hexagonal nut
20 Nm
change
Sealing ring
change
Sealing plug
Vacuum line
place in the servo brake
Sealing
for servo brake
Self-locking hexagonal nut
change
20 Nm
Boot
ensure proper seating, aspiration noises may occur
Support
Connect the brake pipes, brake cylinder pipes (Tandem) to the
ABS hydraulic unit
N55
Vehicles with ABS, ABS/EDS and ABS/EDS/ASR
A
Floating plunger loop
B
Pressure plunger loop
1
Hydraulic unit for right front brake caliper
2
ABS hydraulic unit
N55
to the wheel cylinder/left rear brake caliper
3
ABS hydraulic unit
N55
to the wheel cylinder/left rear brake caliper
4
ABS hydraulic unit
N55
to the left front brake caliper
Vehicles with ABS/EDS/ASR/ESP
A
Floating plunger loop
B
Pressure plunger loop