Volkswagen Golf / Golf GTI / Jetta. Manual — part 404

noticed

26 - Bracket

Hydraulic unit, brake booster/master cylinder, overview

45-9

Brake lines from brake master
cylinder to hydraulic unit,
connecting

Fig. 1

Vehicles with ABS

A - Secondary piston circuit

B - Primary piston circuit

1 - Hydraulic unit to right front brake
caliper

2 - Hydraulic unit to left rear wheel
cylinder/brake caliper

3 - Hydraulic unit to right rear wheel
cylinder/brake caliper

4 - Hydraulic unit to left front brake
caliper

Fig. 2

Vehicles with ABS/EDL

A - Secondary piston circuit

B - Primary piston circuit

Hydraulic unit, brake booster/master cylinder, overview

45-10

Hydraulic
unit/ABS
control
module,
removing
and
installing

Special tools
and
equipment

VAG 1331

Torque
wrench or
equivalent

VAG 1410

Torque
wrench or
equivalent

VAG

1869/2
Brake
pedal
depressor
or
equivalent

Hydraulic unit, brake booster/master cylinder, overview

45-11

Additional required information
sources

Repair Manual, Brake System On

Board Diagnostic (OBD), Repair
Group 01

Component location:

The ABS control module is bolted
together with the hydraulic unit and
is located in the engine
compartment, left side.

CAUTION!

Brake lines in the area of the
hydraulic unit should not be bent!

Removing

- For vehicles with a coded radio,

obtain code.

- Disconnect battery

Repair Manual, Electrical

Equipment, Repair Group 27

- Disconnect electrical connector -

1- of Mass Air Flow MAF sensor
from air filter tube.

- Remove bolts -2- at air filter -3-

and move filter to left side.

- On vehicles with Diesel engines,

remove relay panel above brake
booster.

Hydraulic unit, brake booster/master cylinder, overview