Hydraulic unit, servo-brake/master cylinder - Bosch 5.7 - assembly overview — VW

Hydraulic unit, servo-brake/master cylinder - Bosch 5.7 - assembly overview on VW: factory workshop procedure. Full factory text, tools and checks.

Workshop procedure for VW — the factory write-up, straight from real workshop data.

factory workshop text

📋 Procedure

ℹ️ Torque figures below come verbatim from workshop data — always cross-check against your vehicle's factory manual before final tightening.

VW
SpaceFox, Suran, Sportvan
2006
Running gear
Brake systems
Edition
07.2007
Hydraulic unit, servo-brake/master cylinder - Bosch 5.7 - assembly overview
The master cylinder and the servo-brake can be individually replaced.
ABS control unit
J104
Remove and install
Chapter
Hydraulic ABS unit
N55
At the hydraulic unit the
ABS hydraulic pump
V64
and the intake and exhaust valves are checked by means of the self-diagnosis system
The
ABS hydraulic pump
V64
and the valve block can not be separated
Remove and install
Chapter
Bolt
3 Nm
Brake pressure sensor 1
G201
Remove and install
Chapter
Brake piping connection
Hydraulic unit to the left front brake caliper
Hydraulic unit identification
“VL”
Brake piping connection
Hydraulic unit to right front brake caliper
Hydraulic unit identification
“VR”
Brake piping connection
Brake master cylinder/floating plunger circuit to the hydraulic unit
Hydraulic unit identification
“HZ2”
Brake piping connection
Brake master-cylinder/pressure plunger circuit to the hydraulic unit
Hydraulic unit identification
“HZ1”
Brake piping connection
For the left rear brake caliper
Hydraulic unit identification
“HL”
Brake piping connection
For the right rear brake caliper
Hydraulic unit identification
“HR”
Servo-brake
On gasoline engines, the required vacuum is taken from the intake manifold
On diesel engines, there is a vacuum pump for vacuum transformation
Check the function:
Fully press the brake pedal several times with the engine turned off (this eliminates any remaining vacuum inside the servo-brake).
Hold the brake pedal with average strength at braking position and turn the engine on. A fully operational servo-brake may be noticed while ones foot is on the pedal (active amplification).
In case of faults, completely replace the servo-brake.
Check the check valve (in the vacuum hose)
Chapter
Remove and install
Chapter
Seal
To servo-brake
Hexagon nut
Self-locking
28 Nm
Seal ring
Replace whenever the master cylinder is removed
Hexagon nut
Self-locking
20 Nm
Master cylinder
Can not be repaired. In case of fault, replace it completely
Remove and install
Chapter
Stop pins for the brake fluid reservoir
Insert through the brake master cylinder
Seal plug
Moist with brake fluid and press into the brake master cylinder
Seal plug
Connection for vacuum hose
Brake fluid reservoir
Cover
Hexagon nut
Self-locking
20 Nm
Support
Stud bolt
Welded to body
Bolts
8 Nm
Support
Bolts
8 Nm
Hexagon nut
Self-locking
20 Nm
Stud bolt
Welded to body

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TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

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Workshop data on this page last updated 20 Sep 2026.